I46 TRANS. ST. LOUIS ACAD. SCIENCE. 



neuration, is distinguishable by having no white spot before the 

 tegu'as, by the pale bands on the abdomen, by the different struc- 

 ture of the :st abdominal joint, and by having no fovea? in the 

 suture behind that joint. 



Gfnus EXETASTES, Gravenhorst. 



In this genus the mouth is a little rostriform, the clypeus and 

 mandibles being elongated so that the whole extends beyond the 

 eyes by a space nearly equal to their longer diameter. The cly- 

 peal suture is obsolete. In both my species the 1st joint of the 

 antennas is obliquely truncate rather laterally than beneath as 

 Brulle describes it. The areolet is large and rhomboidal, and 

 varies occasionally by being slightly peduncled. The bullae are 

 4, or sometimes 3 only ; A small and indistinct, and sometimes 

 entirely obsolete, normally located ; B normal ; CD well for- 

 wards on its vein, and E in suaveolens, n. sp. (22 specimens), re- 

 markable for being always nearer to the areolet than to the angle 

 of its vein, but in fascipennis, Cress. (1 specimen), exactly in the 

 middle. In a single % of the former species the normal stump of 

 a vein on the 1st recurrent vein is obsolete. Judging from the 

 one species of which I have numerous specimens, the coloration 

 varies but very slightly, the size is remarkably constant, and there 

 are none but the necessary sexual distinctions. 



Exetastes suaveolens, n. sp.— ^ $.— Black. Head opaque, with fine, 

 dense punctures; clypeus as long as wide, its terminal \ glabrous, polish- 

 ed, and semicircular. Palpi blackish. Antennae as long as the body, 

 brown-black, very rarely $ with the flagellum reddish-brown; 1st joint of 

 the flagellum 4^ times as long as wide; joint 2 half as long as 1 ; the rest 

 gradually shorter. Thorax subopaque, with fine, dense punctures; scutel 

 elevated. Metathorax square, coarsely rugoso-punctate, with the lunate 

 area and 6 parallel longitudinal carina;, including the 2 lateral ones, all 

 more or less indistinct, but generally present; the cross-carina: obsolete. 

 The hind angles above the hind femora terminating in 2 small, robust 

 thorns, transversely arranged. Abdomen glabrous and highly polished, 

 more or less curved, usually in a quadrant. Joint 1 thrice as long as wide, 

 twice as wide behind as before, its sides straight, save that the spiraculi- 

 ferous tubercle projects a little laterally \ of the way to the tip, behind 

 which points the whole dorsal surface is gently excavated; carina; obso- 

 lete except at the extreme base. Joint 2 longer by \-\ than wide, accord- 

 ing to the degree of compression ; the rest gradually shorter. Ovipositor 

 and sheaths rufous or blackish, very short, exserted, but scarcely project- 

 ing beyond the tip of the abdomen. Venter generally protuberant, some- 

 times excavated, always more carinate longitudinally, except in a single 



