86 



and all the other species which I have seen, except moUto?', live 

 in rotten trees. 



No. 292, badius Say. 



No. 429, reflexus Say. 



No. 903, interstitialis Say. 



No. 715, Tenebriof [= "C/Zoma/ocZims Germ., teste Hentz," 

 Harr. mss. Catal.] blackish-brown, polished, head with a trans- 

 verse, broad impression, antennas hairy; thorax distinctly 

 punctured ; elytra punctato-striate, interstitial lines convex, 

 sublgevigated ; anterior and intermediate tibias denticnlated on 

 the external edges. Male with a broad, transverse depression 

 on the thorax near its tip. Length from .40 in. to .45 in. ; 

 breadth from .16 in. to .19 in. This insect resembles haclius, 

 but the foveolate head and thorax and denticulated tibia3 suffi- 

 ciently distinguish it. Probably it does not really Ijelong to 

 the genus Tenehrio. 



In answer to your queries for a diagnostic between the sexes 

 of the Apidce. and Vespidce^ I can tell you but little more than 

 you will find in Kirby and Spence, III, pp. 301—347. In the 

 male the antenna? are generally longer and have more joints 

 than in the female. The eyes of -the male are often very large, 

 and nearly meet on the top of the head, which, however, is 

 smaller than that of the female ; Apis and Xylocopa are exam- 

 ples. The male Polistes fuscata may always be known from 

 the female and neuter by its white face. In some genera, as 

 Trachusa Jurine, Megachile, Coelioxys^ the anus of the male is 

 bifid, and of the female acuminate. In other genera this part 

 is obtuse in the male and acuminate in the female. 



HARRIS TO HENTZ. 



Milton, Oct. 24, 1829. 

 My Cistela sulphurea? Fabr., I believe to be identical with 

 C sericea Say, Journ. Acad., but not the same as C. sericea 

 Say, Long's Exped. These two species of Professor Say I 



