314 AMERICAN HYMENOPTERA. 



Undoubtedly many of tlie Middle Sonoran species range into the 

 Lower Sonoran of Arizona and Mexico ; how many, the imperiec- 

 tion of our knowledge prevents us from deciding. It is probable 

 that the Middle Sonoran is to be distinguished from the Lower by 

 the absence of various types existing in the latter, rather than by 

 the presence of peculiar types of its own. The following species 

 may be cited as occurring in the Lower Sonoran of Arizona, but 

 apparently not entering New Mexico: 



Centris atrip es Mocs. (Douglas). Oxsea tristis Gvihocio (Douglas). Collefes tucson- 

 ensis Ckll. (Tucson). Xylocopa varipuncta Patt. (Tenipe). Ceratina arisonensis 

 Ckll. (Phoenix;. Halictus kunzei CkW. (Phoenix). Centri» pallida Fox (Phoenix). 

 Perdita bacchnridis Ckll. (Teinpe). P. melliva Ckll. (Phoenix). P. heterothecse 

 Ckll. (Tempe, Phoenix). Xenoglossa patricin arigusiior CkU. (Buckeye). Hypoma- 

 crotera callops iwrsimilis CM\. (Phoenix). Bombomelecta arizonica Ckll. (Teinpe). 

 Triepeolus helitmfhi arizonensis Ckll. (Phoenix). T. pimarum Ckll. (Alhairibra). 



Some of these reappear in the Lower Sonoran of Texas. 



New Species. 

 Xenoglo<>iSodes neolomee n. sp. 



A small species witli narrow abdomen in the 9 , allied to X. lippice. 



J. — Length about lOh mm.; hair of face, eheeks and pleura white; of head 

 and thorax above pale ochreous; diflers from lippiie \n being smaller, with the 

 ahdomiual bands yellowish instead of white; the apical one on the second seg- 

 ment entire; the black interval between the bands on the thii'd wider, being of 

 the same width as the apical band ; the fourth segment ornamented like the 

 third, with the margin of the apical band straight; the fifth and sixth segments 

 heavily fringed with creamy-white hair, stained with reddish in the middle; the 

 hair on inner side of basal joint of hind tarsi very light fulvous; the hair of 

 thorax above strongly yellowish ; the antenna; considerably shorter, and the fla- 

 gellum more or less dark reddish beneath. Euns in my tables near T. actuosa, 

 but the mesothorax is shining, and the abdomen is of an entirely diflFerent shape. 



"J, . — Length 10 mm.; more like lippise ; hair of head and thorax white above 

 and below, or faintly yellowish above: flagellum long, strongly crenulate, very 

 dark reddish beneath; clypeus and labrum entirely pale lemon yellow; mandi- 

 hles with a large yellow spot; abdominal segments with only the apical hair-bands 

 distinct ; tegulai pale testaceous. 



In Proc. Biol. Soc. Wash., 1905, p. 179, I called attention to the 

 Xenoglossodes-Yike palpi of Tetralonia lippke. The present species 

 bridges over the gap between lippke and ordinary Xenoglossodes to 

 a considerable extent, and I think both should be referred to that 

 genus. 



^o6.— Raton, New Mexico, August, 1 9 , 2 J^ (T. D. A. and W. 

 P. Ckll.). A^ neotomce derives its name from Xeotoma, the wood- 

 rat, whicli yave rise to the name Raton. 



