1916] Cockerell — Panurgine Bees 177 



3. Wings perfectly clear larreoe Ckll. 



Wings brownish 4 



4. Wings milky at apex; legs of male wholly black olivioe Ckll. 



Wings not milky at apex; male tarsi variably reddish 



rhodocerata Ckll. 



The description of 9 rhodocerata, as originally given (Panurgus 

 rhodoceratvs. Trans. Am. Ent. Soc, XXIV, p. 148), included the 9 

 of H. olivia\ which is separable with difficulty. The males are 

 more distinct and the cf rhodocerata may be regarded as the type. 

 Both species visit the flowers of Pedis in September. 



Zacesta Ashmead, 1899, was described as a member of the 

 Osmiinse, but Titus (Jn. N. Y. Ent. Soc, XII, p. 26) showed that 

 it was a Panurgid. It comes from Los Angeles Covmty, Cal., 

 and is known only in the male. Examining the type of Z. 

 rufiyes Ashm. in the U. S. National Museum, I found that it closely 

 resembled Hesperapis as typified by H. elegantula. The following 

 characters are noteworthy : 



(1) The moss-like ochraceous hair on thorax above, as in typical 



Hesperapis. 



(2) The narrow face and essentially parallel orbits, as in H. ele- 



gantula. 



(3) The orange flagellum, as in H. elegantula, but the scape 



shorter and stouter (sexual character.'^). 



(4) Clypeus has a broad yellow apical band, not seen in Hesperapis 



(but male of H. elegantula is unknown). 



(5) Compared with H. elegantula has larger, shining, area at base 



of metathorax. 



(6) Venation is as in H. elegantula, except that second submarginal 



cell is longer, and the lower section of basal nervure descends 

 much less abruptly. 



(7) The pygidial plate is long and narrow. 



(8) Titus has described the palpi of Zacesta; the first three joints 



of labial palpi are nearly equal whereas in H. elegantula 

 the first is nearly as long as 3 plus 4, the second somewhat 

 shorter than the first. 



Hesperapis, as interpreted above consists of at least two very 

 distinct groups, one typified by H. elegantula (type of genus), 

 and the other containing the remaining species. Zacesta is per- 



