H. C. FALL 395 



rather more than twice the length of the basal joint. Antennae attaining the 

 hind coxae in the female, a little longer in the male, tenth joint about three 

 times as long as wide. 



Prothorax widest at about the basal fourth, a Uttle contracted basally with a 

 shght sinuation before the angles, moderately convergent and broadly arcuate 

 or nearly straight in front; punctuation rather coarse and close, somewhat 

 uneven, side margin smoother; M broad, diffuse, pale brown. 



Elytra densely, coarsely and in great part confusedly punctured, the second 

 or third stria or both usually fairly regular and entire, as are the seventh and 

 eighth, the apical portions of some of the others more or less distinct; striae 

 feebly impressed; shield small and indistinct or wanting; marginal interspace 

 broad and numerously punctate in at least the basal haKortwo-thii'ds;standard 

 spots usually not defined. In the type the shoulder knob is dark and the 

 apical outer spot is distinct, the inner spots suffused into a broad blackish 

 sutural cloud which is somewhat disintegrated or encroached upon by yellow 

 spots at the middle externally. In other examples the outer spots are entirely 

 wanting and the median cloud is paler brown. 



Pygidium yellow with the usual bisinuate blackish border at base. Body 

 beneath brown to blackish with the tip of the abdomen pale. Legs pale with 

 light brown spots or rings on the femora and tibiae, sometimes indistinct. 



Length 3.1 to 3.5 mm.; width 1.7 to 1.85 mm. 



Distribution. — California: Pasadena, May, type cf; Laguna Beach (Baker); 

 Los Angeles Co. (Coquillett in Nat. Mus. Coll.); (Van Dyke); San Bernanlino 

 Co. (\'an Dyke). 



After a good deal of comparison and deliberation I still feel 

 considerable uncertainty as to the standing of this species. The 

 problem, however, may be considered a jiart of that involved in 

 the relationship of arizonensis and punctatus and their varieties 

 or allied forms, for nubigenus is surely closely related to these 

 though removed from them for convenience in tabulation. Super- 

 ficially nubigenus is at once distinguishable from either of these 

 species by the dorsal cloud on the elytra. In punctatus the 

 elytral spots are occasionally well developed, more especially in 

 the var. shasta, but in my experience the spots are always more or 

 less clearty defined, never broadly suffused into a single cloud as 

 in nubigenus; and moreover it is in the female of punctatus that 

 the maculation is most developed, the male only rarely showing 

 traces of spots, while in nubigenus the dorsal cloud N l)r()adest or 

 at least darkest in the male. In arizonensis the elytra appear to 

 be invariably completely devoid of maculation, the discal punc- 

 tuation is rather less dense, the elytral series of punctures a little 

 better defined, and the front claws of the male a trifle smaller 

 relativeh" than in nubigenus. In both punctatus and arizonensis 



TRANS. AM. ENT. SOC, XLI. 



