592 PROCEEDINGS? OF THE NATIONAL MUSEUM. vol.50. 



14. General color yellowish brown or blackish 17. 



General color yellow or orange yellow with the dorsum of abdomen sometimes 

 blackish brown. 



Notum bright orange yellow 15. 



Notum pale clay yellow, dorsum of abdomen more or less blackish. 



39. luteolus, new species. 



15. Scape with a small streak of black on upper margin near apex 16. 



Scape marked with an oblique fascia near the middle 37. philippiae Martelli. ■ 



16. Front and vertex .only one-fourth longer again than wide, funicle and club uni- 



formly brownish 31. stomachosus Girault. 



Front and vertex considerably narrower, club usually darker at base than preced- 

 ing funicle joints 38. Jlaviis Howard. 



17. Collar of pronotum whitish with black dot on each corner 20. 



Collar of pronotum entirely black, or concolorous with mesoscutum. 



Antennae uniformly brownish 18. 



Antennae not uniformly colored 19. 



18. Coloration dark yellowish brown; head yellowish 42. immaculatus Howard. 



Coloration shining black 34. nitens Kourdumoff. 



19. Scape yellowish with upper and lower margins darker, cheeks mostly blackish. 



23. claviger, new species. 

 Scape yellowish with an oblique fascia near apex, cheeks mostly yellow. 



36. aZfterii Howard. 



20. Venter of abdomen more or less brownish 21. 



Venter yellowish like rest of underparts 30. emptor Howard . 



21. Mesopleura brown 28. ceroplastis Howard. 



Mesopleiu"a yellow 29. mexicanus Howard. 



In addition to the species given in the above tables, there are in 

 the United States National Museum several unplaced males, which 

 may prove to be the opposite sex of some of the species aheady 

 described. One interesting species represented only by males 

 (Charlottesville, Virginia) runs in that sex to Ayhycus maculipcnnis 

 and melanostomatus, but differs from either in being almost entirely 

 black in coloration. Another species (also from CharlottesvUle) 

 runs to Ainliycus niayri, and differs in the male sex, in having the 

 mesoscutum entirely black and the pleura except the anterior mar- 

 gin blackish. It is apparent, therefore, that although the North 

 American of ApTiycus have been made known for the most part, 

 there still remains much work in correctly assigning and describing 

 the males. This work is the more important, as species which are 

 very similar in the female sex may differ widely in the male sex, 

 for the males may be either essentially like the females in coloration 

 or much different. 



It has been found necessary to suppress only one of the described 

 species, ApJiycus Jlaviceps Howard described from supposed females, 

 proving to be identical with the male type of maculipes. It may be 

 pointed out, however, that Apliycus oregonensis Howard, also de- 

 scribed from supposed females, in all probability will prove to be 

 the male sex of californicus. The latter species itself is nearly iden- 



