H. C. FALL 381 



The type and all other specimens but one are females; this one 

 being a male from Brownsville which is doubtfully referred. In 

 it the eyes are separated bj' a distance just visibly greater than 

 the length of the first two antennal joints, and on this character 

 the species is given the place it occupies in the table. In appear- 

 ance it is more like califiiis, in which, however, the eyes are very 

 distinctly more approximate. The front claws of the Browns- 

 ville male are not appreciabh' enlarged nor is any such modifica- 

 tion indicated for the male by the size of the front claws in the 

 female. 



64. Pachybrachys prosopis new .species 



Dull fiavous to rufo-testaceous, varialjly maculate with brown 

 or fuscous; eyes in male separated by the vertical width of their 

 up]ier lobes; ocular lines fine but evident; elytral striae fairly 

 regular; front claws of male onh- slightly larger than the others. 

 Ave. length 2.6 mm. Desert region of California and Arizona. 



Head coar.sely somewhat irregularly punctate, ocular lines rather fine, more 

 distant from the eyes than in calidus. Eyes separated in the male by the 

 length of the first two antennal joints, and in the female by two and one-half 

 to nearly three times the length of the basal joint. Antennae short, in the 

 male not passing the hind coxae, in the female scarcely half as long as the body, 

 tenth joint not or scarcely more than twice as long as wide, at least in the 

 female. 



Proihorax a little narrowed in front, more coarsely punctate than in calidus, 

 the M very variable in development, sometimes almost obsolete, sometimes by 

 difi'usion involving ahnost the entire disk, usually rather broad and not as 

 sharply defined as in calidus. Eh-tral markings similarly variable, the spots 

 typically well developed nearly as in calidus, but in some males much reduced; 

 surface striate except in the baso-sutural triangle, the striae more or less sin- 

 uous but entire, some or all of striae four to six, however, more or less inter- 

 rupted or broken at middle; shield rather large and conspicuous, subtriangular; 

 marginal interspace nearly or quite impunctate. 



Pygidium, under surface and legs as in calidus. 



Length 2.3 to 3 mm.: width 1.2 to 1.65 mm. 



Distrihuiioyi. — Calljornia: Palm Springs, April (type 9 ) on inesquite; 

 Yuma, April (Fenyes); Inyo Co. (Ricksecker); Death Vallej', April (Koebele 

 in Nat. Mus. Coll.); S. E. Cal. (Am. Ent. Soc. Coll.). Arizona: Laguna Dam, 

 Mar. 10 (Clemence); "Ari." (Morrison— Nat. Mus. Coll.). 



This species, as indicated in the flescri])ti()n, is similar in many 

 ways to calidus. It is on the average a distinctly smaller insect, 

 relatively more coarsely punctured, apparently more variable in 

 color, with more widely separated eyes and larger elytral shield. 



TRANS. AM. ENT. SOC, XLI. 



