Main
 Dissections
 Keys
 Links
 Map Index
 Methods &
 Terminology
 Photo Index
 Species
 Accounts  
 Guestbook

KEY TO THE UNITED STATES NEIVAMYRMEX

KEY TO MALES

 1      Vertex concave in profile and preoccipital margin raised and collar-like          (Figs. 98, 108). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
 --      Vertex flat or low-convex and preoccipital margin not collar-like
          (Fig. 94, 104, 106) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

 2(1)    Inner margin of mandible moderately convex at midlength (Fig.107);            paramere narrowly rounded at apex  (Fig, 132) . . . . . . . . . . . .pilosus
 --        Inner margin of mandible straight or weakly convex at midlength            (Fig.97); paramere blunt and broadly truncate at apex (Fig. 124). .            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mandibularis

 3(1)    Mandible strongly curved, rapidly tapering to acute apex
           (Figs.91, 92, 99, 101). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
 --       Mandible blade straight or weakly curved, sometimes parallel-sided            (Figs. 94, 103, 105, 109). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4(3)      Larger species, HW at least 2.0mm . . . . . . . . . . . . . . . . . . . . . . . .5

 --         Smaller species, HW less than 2.0 mm  . . . . . . . . . . . . . . . . . . . . . .6

 5(4)     ML subequal to EL; OD less than 2.5 x OOD (Fig.91); paramere with             rectangular dorsal process and triangular ventral process (Fig. 121) . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .andrei

 --        ML greater than EL; OD more than 2.7 x OOD; paramere broadly             rounded with shallow dorsal concavity (Fig. 133) . . . . . . . . .swainsonii

 6(4)    Apicodorsal process of aedeagus broad and beak-like, extending beyond             apicoventral process in lateral view (Fig. 111, 112) . . . . . . . . . . . . . .7

--         Apicodorsal process of aedeagus not beak-like, not extending beyond             apicoventral process (Fig.110, 113-120) . . . . . . . . . . . . . . . . . . . . . .8

7(6)      Larger species, HW at least 1.5mm; pilosity of body appressed; volsella             with apical fork. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . fuscipennis

 --        Smaller species, MHW not over 1.2mm; pilosity of body consisting of             long sparse suberect to erect hairs; volsella without apical fork
            (Fig. 132) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .melshaemeri

 8(6)     Ocelli small, OOD equals or exceeds OD (Fig. 99, 100) . . . . . . . . .9

 --         Ocelli larger, OOD no more than 00.30 x OD (Fig 101, 102). . .minor

 9(8)      Head in frontal view without prominent dorsolateral angles (Figs. 91,              93, 94, 99, 101, 103, 105, 109); volsella with apical fork (Figs 133,              134, 135, 136, 137) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

 --          Head in frontal view with prominent dorsolateral angles (Fig 92);                volsella without apical fork . . . . . . . . . . . . . . . . . . . . . . . . . .baylori

10(9)       Head and mesosoma black, gaster reddish brown  (Arizona, California,                Baja California)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

 --            Head and entire body dark charcoal gray  (Arizona) . . . . . . .microps

11(10)     Very small species, HW less than 1.0 mm; head and mesosoma                 blackish brown, gastral   segments 1-2 mostly brown, merging into                 more reddish distal segments; posterior margin of head concave,                 preoccipital margin   forming low upturned collar; first two gastral                 terga brownish, following segments more distinctly reddish (Arizona)                  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ndeh

 --             Larger species, HW over 1.3 mm; posterior margin of head broadly                 convex; preoccipital margin inconspicuous, forming a small ridge or                 lip; gaster uniformly reddish brown (California, Baja California)  . . . .                 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .mojave

12(3)        OOD exceeding OD, usually at least 2.0 x OD . . . . . . . . . . . . . . .13

 --            OOD no more than about 0.5 x OD, usually less (Figs. 101) . . . . . . .                 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .harrisi

13(12)     Distal 0.66 of mandible slightly convex along inner margin, usually                 wider than base, apex narrow and slightly pointed
                (Figs. 103, 105, 109,). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

 --            Distal 0.66 of mandible no wider than base and apex usually blunt
               (Figs. 93, 94) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     15

14(13)      Frons, on each side, prominently swollen above antennal fossa
              (Figs. 103, 104); proximal flange on ventral margin of paramere                complete (Fig. 130). . . . . . . . . . . . . . . . . . . . . . . . . . . . . nigrescens

 --           Frons not swollen above antennal fossa; (Figs, 105, 106); proximal                flange on ventral margin of paramere incomplete (Fig.131) . . . . . . . . .               . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .opacithorax

15(13)     Mandible evenly tapering to broadly rounded tip (Fig 93, 94); paramere                without prominent apicodorsal process (Fig 122, 123) . . . . . . . . .   16

--            Mandible about equally wide for most of its length, abruptly narrower                near apex (Fig 109); paramere with prominent apicodorsal process,                small sharp hooked tooth at tip of apicodorsal process  (Fig. 134). . . .                . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . texanus

16(15)     Larger species maximum HW ca 1.75mm; scape approximately                 parallel-sided, 3 x longer than broad (Fig. 93). . . . . . . . . carolinensis

 --            Smaller species, HW not over 1.5 mm; scape approximately pyriform,                 2 x longer than broad (Fig. 94) . . . . . . . . . . . . . . . . . . . kiowapache


Any questions regarding this page, e-mail Gordon
• • •
Date of this version 27 May, 2005
• • •
All text and images contained on this web site are copyright ©
2000 - 2005 by Gordon C. & Roy R. Snelling