102 E. T. CRESSON. 



Coelioxys totonaca. — 9 • — Black : head as in oiomita; mesotliorax shin- 

 ing, with large deep, not close, punctures; anterior margin, continued beneath, 

 spot behind tegula3, and band at base of scutellum of dense pale ochraceous 

 pubescence; sides of metathorax with long pale hairs; the usual line of white 

 pubescence on posterior margin of pleura parallel with that on anterior margin, 

 and a patch of dense snow-white pubescence between middle coxse, which are 

 elongate subcylindrical in profile; scutellum with large deep punctures, angu- 

 lar behind, the tip with a short obtuse tooth, lateral teeth long, divergent, and 

 compressed laterally at tip; carina before tubercles prominent, 

 sinuate; tegulse and legs fulvo-ferruginous; wings dusky on 

 apical margin and on upper half of marginal cell; coxae 

 blackish, femora and tibise with a line of snow-white pubes- 

 cence; abdomen shining, with scattered punctures, apical 

 margin of segments 1 — 5 with a narrow fringe of white 

 "t^^^X^ pubescence, sides of first segment ferruginous; apical seg- 

 ment (fig. 1) longitudinally depressed and roughened on each 

 side towards apex, which is rounded, the sides slightly sinuate, a well defined 

 central longitudinal carina on apical half; venter as in oiomita, except that 

 the apical segment (fig. 2) is much shorter and broader, a little longer than the 

 upper, slightly incurved, and with the tip suddenly narrowed, (fig. 3, apex in 

 profile). Length .40 inch. 



•J, .—Face densely clothed with pale ochraceous pubescence, longer on vertex ; 

 mandibles ferruginous; lower part of cheeks deeply and broadly grooved, pos- 

 terior margin carinate; abdomen as described in mexicana, except that apical 

 teeth are more acute. Length .35 inch. 



Hub. — Mexico, (Sumiehrast). Four specimens. The scutellum of 

 this species has much the same form as that of chichimeca, except 

 that the apex has a short blunt tooth and the disk has a well defined 

 longitudinal carina. 



Coelioxys gerniana. — 9 . — Rather more robust than totonaca and differs 

 only as follows; the pubescence is everywhere snow-white; the face is rather 

 broader; the middle trochanters are not elongate subcylindrical, but shaped 

 like the posterior pair, and the abdomen is without any ferruginous color, the 

 white fascia on dorsal segments are slightly dilated laterally, and the last 

 ventral segment is suddenly constricted nearer to the tip, making the append- 

 age shorter. Length .45 inch. 



Hub. — Illinois, (Dr. Samuel Lewis). One specimen. 



Osiiiia niandibularis.— 9-— Steel-blue, shining; head and thorax 

 closely and strongly punctured, clothed with short whitish pubescence, longer 

 and more dense on the face; head very large, subquadrate; clypeus short, 

 anterior margin very uneven and with two short tubercles at tip; mandibles 

 black, with a large knotty process at base above, deeply grooved on the 

 outside and coarsely rugose within, on their face a patch of dense yellowish 

 pubescence; antennte short, slender, black; tegulse piceous; wings fuliginous 

 on apical margin, and on upper half of marginal cell; legs slender, black, 

 thinly clothed with griseous pubescence; abdomen shining, finely punctured, 

 clothed at the sides and on lateral apical margin of the segments with whitish 

 pubescence; ventral scopa black. Length .65 inch. 



