AMERICAN HYMENOPTERA. 95 



CcBlioxys tolteca.— 9- — Black, smooth and shining; middle of face 

 longitudinal)}' prominent, the ocelli place in moderately deep fovese; eyes 

 with very short hairs; sides of face and cheeks clothed with a very short 

 dense pale ochraceous pile; occiput fringed with pale pubescence; clypeus 

 deeply punctured; mandibles ferruginous; mesothorax with a few scattered 

 deep punctures on the sides and behind; scutellum (fig. 1) large, extending 

 over the metathorax, flat at base, angular and recurved at tip, the sides with a 

 few deep punctures, the lateral teeth long, broad at base, subacute and twisted 

 at tip; a line on anterior margin of thorax continued beneath, spot before 

 tegulse, two spots at base of scutellum, and line 

 on posterior margin of pleura, composed of dense 

 appressed whitish pubescence, the sides of the 

 metathorax have a rather long, thin pale pubes- 

 cence ; in front of teguise a sharp transverse 

 carina; tubercles, tegulse and legs ferruginous; 

 wings tinged with dusky on apical margin; abdomen smooth and shining, 

 having a few scattered punctures, segments 2 — 5 have a rather deeply im- 

 pressed line on each side, and all the segments except the last have an apical 

 fringe of short dense white pubescence, slightly interrupted in the middle; 

 apical segment (fig. 4) rather short, rounded at tip, a sharp longitudinal central 

 carina, on each side of which at tip there is a deep oblique groove ; venter fer- 

 ruginous laterally and at tip, sparsely and strongly punctured, last segment short, 

 broad, extending a little beyond the last dorsal segment, rounded at tip, (fig. 2, 

 apex of abdomen in profile; fig. ?>, apex from beneath). Length .40 inch. 



Hab. — Mexico, (Sumichrast). One specimen. 



Coelioxys aperta. — 9- — Black, opaque, head and thorax densely and 

 confluently punctured; face, vertex and cheeks clothed with a dense white 

 pubescence, that on middle of vertex radiating around the lower ocellus; top 

 of head uniformly punctured; pubescence on eyes short; mesothorax above 

 clothed with short sparse pale pubescence; anterior margin of thorax, spot on 

 anterior middle of mesothorax, line over tegulse, and line before scutellum, 

 of short appressed white pubescence; sides of thorax, metathorax and post- 

 scutellum thickly clothed with long pale pubescence; scutellum (fig. 1) broadly 

 rounded behind, with a short obtuse tooth at tip, lateral teeth acute and slightly 

 bent inwardly; immediately before the tegulse a 

 sharply defined acute transverse carina; wings 

 tinged with fuliginous at tip; tegul^ and legs 

 black, the latter with short whitish pubescence, 

 tibial spurs ferruginous; abdomen shining toward 

 tip deeply punctured, more densely so at base, 

 finely so on apical segment; sides of first segment with rather long pale 

 pubescence, apical margin of segments 1 — 5 with a narrow fringe of white 

 pubescence; second and third segments with a transverse deeply impressed 

 line across the middle; apical segment (fig. 4) broad, short, narrowed gradually 

 to tip which is rather broadly rounded and depressed; ventral segments 2 — 5 

 each with an apical fringe of dense white pubescence; apical segment (fig. 3) 

 broad, rather short, extending beyond the upper segment and having a shor-t 

 appendage at tip, (fig. 2, apex in profile). Length .60 inch. 



Mub. — Colorado, (Morrison), One specimen. 



