NORTH AMERICAN ACROLOPHIDAE — ^HASBROUCK 653 



Type locality. — Mohave Co., Ariz. (June, collector unknown). 

 Distribution. — Southwestern United States. Arizona, New Mex- 

 ico, and Texas. 

 Specimens examined. — 17 (14 (f d^, 3 99), from 4 localities: 



Arizona: Boulder Springs, Mohave Co., cf (July 1-15, 1921, O. C. Duffner); 

 Mohave Co., 7 cf c?", 9 (June &-15, one cf with mites, collector unknown), 9 (June 

 16-23, collector unknown), cT (Jul}-- 8-14, collector unknown). New Mexico: 

 Carlsbad Cavern, Eddy Co., 4 d' cT (May 16, 1927, J. O. Martin), 9 (May 17, 

 1927, Martin). Texas: Alpine, Brewster Co., d^ (May 5, 1927, J. O. Martin). 



Remarks. — This subspecies should also be found in the southern 

 portions of Utah, Nevada, and California. In addition, it undoubt- 

 edlj'' ranges southward into Mexico. 



The complex species, sinclairi, is closely related to persimplex and 

 fervidus, forming with them a rather distinct species group. This 

 group has already" been characterized in the foregoing remarks on 

 fervidus. A. sinclairi may be distinguished from its close relatives, 

 as well as from the other members of the genus, on the basis of its 

 antennal and genital structure. The antennae may be either uni- 

 pectinate or reduced bipectinate. 



The subspecies, sinclairi sinclairi, may be separated from its com- 

 panion subspecies, sinclairi nelsoni, on the basis of antennal structure. 

 The former exhibits unipectinate antennae and the latter has antennae 

 of a reduced bipectinate type, both conditions being described in de- 

 tail in couplet 48 of the key (p. 519). The two subspecies have different 

 geographical distributions. They can not be satisfactorily distin- 

 guished from each other by genital differences. The genitalia of sin- 

 clairi sinclairi exhibit afl5nities with those of the complex species, 

 griseus, although their respective aedeagi are quite distinct and the 

 two are generally dissimilar in regard to other structures. The 

 cucullus of the harpe in sinclairi sinclairi is somewhat variable. In 

 the specimens from Arizona, the ventral portion of the apex of this 

 structure is quite markedly expanded ventrad, whereas the specimens 

 from New Mexico and Texas exhibit a correspondingl}^ less pronounced 

 expansion. This subspecies is named for the George M. Sinclair 

 family of Urbana, 111. 



39b. Acrolophus sinclairi nelsoni, new subspecies 



Figures 184-185 



Male. — Coloration and structure, except for antennae, essentially 

 same as in sinclairi sinclairi. Head, labial palpi, and thorax ochreous 

 tinged with white. Labial palpi short, partially recurved but not ex- 

 tending to antennal bases, narrowly separated from each other, closely 

 appressed to head except at apices, densely clothed with slender scales. 

 Eyes rather small, weakly protruding, naked, moderately lashed. An- 



