146 TRANS. ST. LOUIS ACAD. SCIENCE. 



neuration, is distinguishable by having no white spot before the 

 tegulae, by the pale bands on the abdomen, by the different struc- 

 ture of the 1st abdominal joint, and by having no foveas in the 

 suture behind that joint. 



Genus 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 peal suture is obsolete.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 ist joint of the 

 antennae is obliquely truncate rather laterally than beneath a& 

 BruU^ 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, (i specimen), exactly in the 

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

 a vein on the ist recurrent vein is obsolete.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. — (j* $. — Black. Head op&que, with fine, 

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

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

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

 the flagellum 4^ times as long as wide; joint 2 half as long as i ; 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-carinae 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 i 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; carinx obso- 

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

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

 and j-heaths 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 



