AMERICAN HYMENOPTERA. 133 



Xylocopa azteca. — 9- — Black; the pubescence of head entirely black; 

 clypeus flat, finely and sparsely punctured; thorax clothed with sooty pubes- 

 cence, slightly mixed with pale, that on the sides white and that beneath 

 black, disk of mesothorax smooth and polished; wings fuscous; legs clothed 

 with black pubescence, that on the four posterior tibiae and tarsi exteriorly 

 dense pale ochraceous; abdomen with the first and sides of second and third 

 segments clothed with a short pale sericeous pubescence, the apical margin of 

 segments two and three with a narrow fringe of dense pale ochraceous pubes- 

 cence, broadly interrupted medially; three apical segments entirely black. 

 Length .65 inch. 



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



Exomalopsis limata. — 9. — Shining black; head, thorax and extreme 

 base of abdomen clothed with short black pubescence, that on sides of face and 

 narrow anterior margin of mesothorax white, and on cheeks pale; face and 

 clypeus flat; labrum with fulvous hair; flagellum beneath pale testaceous; 

 disk of mesothorax and of scutellum smooth, polished and impunctured; wings 

 fuscous, paler on apical margin; legs with black pubescence, posterior tibiae 

 and tarsi with a long dense fulvous pubescence; abdomen smooth and polished, 

 impunctured, apex with pale fulvous pubescence at sides, apical margin of 

 segments 3 — 5 with a very narrow fringe of white pubescence, slightly inter- 

 rupted on middle of third; ventral segments fringed with long fuscoua hair. 

 Length .40 inch. 



Hah. — Mexico, (Sumiclirast). One specimen. 



Exomalopsis mexicana.— 9- — Black, shining; head, thorax and legs 

 clothed with a griseous pubescence, long and erect on occiput, that on the 

 vertex, mesothorax and scutellum mostly black; sides of face, line on collar, 

 line behind tubercles and line behind scutellum of dense pale ochraceous or 

 whitish pubescence; flagellum fulvo-testaceous beneath ; tegulae piceous; winga 

 hyaline, dusky on apical margin, second submarginal cell receiving the re- 

 current nervure very near the tip; posterior tibiae and tarsi with a dense 

 floccuB of ochraceous pubescence, that on tarsi above sooty-black; abdomen 

 smooth and shining, the base and extreme sides thinly clothed with pale 

 pubescence, base of segments three and four with a band of dense appressed 

 pale ochraceous or white pubescence, sometimes narrowed medially, the fifth 

 segment fringed with long ochraceous pubescence; sometimes the second seg- 

 ment has an oblique line of pale pubescence on each side; ventral segments 

 fringed with long griseous hair. Length .35 inch. 



Hah. — Mexico, (Sumichrast). Three specimens, 



Exomalopsis otomita.— 9 •— Black, clothed with a short black or 

 fuscous pubescence, that on face and cheeks intermixed with pale; on each 

 side of face a small patch of dense white pubescence; flagellum dull testaceous 

 beneath; tegulae piceous; wings yellowish-fuscous, darker on apical costal 

 margin, stigma and nervures pale brown, second submarginal cell broad, re- 

 ceiving the recurrent nervure a little beyond the middle; posterior legs with 

 a dense floccus of long sooty pubescence, with a patch of ochraceous beneath, 

 tips of tarsi pale; abdomen shining, with a slight bluish iridescence, base and 

 sides of first segment thinly clothed with a pale pubescence, that on the three 

 apical segments and venter ochraceous. Length .30 inch. 



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



