NORTH AMERICAN BOSTRICHIDAE 97 



gins slightly elevated on apical declivity; sides parallel, conjointly 

 broadly rounded at apices ; surface coarsely, deeply, densely, irregu- 

 larly punctate, the punctures sometimes becoming very fine and obso- 

 lete'on elytral declivity; apical angles thickened, each with a puncti- 

 form fossa from which arises a tuft of yellow hairs. 



Abdomen beneath densely, finely punctate, sparsely clothed with 

 short, recumbent, yellowish hairs, which are denser along apical mar- 

 gins of sternites: metasternum finely, vaguely punctate; second seg- 

 ment of posterior tarsus slightly longer than last segment, the third 

 twice as long as fourth. 



Female. — Differs from the male in having the apical declivity of the 

 elytra more densely and coarsely punctate, and the apex of each elytron 

 thickened but without a punctiform fossa. 



Length 9-20 mm., width 3.5-7 mm. 



Type locality. — Of forth. Cape San Lucas, Lower California : type 

 in LeConte Collection in the Museum of Comparative Zoology, Cam- 

 bridge, Mass. Of pollens. Bill Williams Fork. Ariz., puncticeps. Ari- 

 zona, no definite locality, and robustus. El Paso. Tex.; types in the 

 Casey Collection in the United States National Museum. 



Distribution. — From material examined: 



Arizona : Yuma, Oracle, Tucson. Catalina Springs. Sabino Canyon, Redington, 

 Xogales. Phoenix, and Bill Williams Fork (type of pollens i. 



California: San Diego County, Bard, Imperial County, Palm Springs, Indio, 

 and Paramint Valley. 



Lower California : San Jose del Cabo. 



New Mexico : Demming. 



Texas : Sabinal, Del Rio, Knippa, San Antonio, Harwood, and El Paso (type 

 of robustus). 



Utah : Hanksville. 



Mexico : Many localities. 



Costa Rlca : Santa Elena, Taboga. 



Nicaragua : Managua City. 



Colombia : Rio Frio. 



Hosts. — This species has been reared from mesquite (Prosopis spp.) 

 and paloverde (Cerridium spp.). Adults are attracted to light from 

 May to November. 



LeConte (I860) described fortis from two specimens collected by 

 Xantus at Cape San Lucas. Lower California. Casey (1898) described 

 robustus from a female collected at El Paso. Tex., and puncticeps from 

 a single female from Arizona, without a definite locality. In 1914 

 Casey described pollens from a single male collected at Bill Williams 

 Fork, Ariz., by F. H. Snow. 



In fortis the size and shape of the posterior angles of the pronotum 

 are quite variable. In reared series of this species the posterior angles 

 of the pronotum are either rounded or more or less rectangular and 

 in some cases are projecting. Some specimens are more or less opaque, 

 but this is due to being somewhat greasy. 



The types of the three Casey species have been examined and no 

 constant characters can be found for separating them from fortis 

 LeConte. 



Genus BOSTRYCHOPSIS Lesne 



BostryehopHs Lesne, 1899, Soc. Ent. de France Ann. (1898) 67: 444. 524-553; 

 Schilsky, 1899, in Kiister and Kraatz, Kafer Europas 36: p. VV : Lesne. 1901, 

 842409—50 7 



