H. C. FALL 437 



Elylrn broadly ponfusedh- punctured in a large baso-.sutural triangle, the 

 punctures arranged posteriorly in short more or less irn^gular scarcely impressed 

 lines, the submarginal stria impressed, leaving the two lateral interspaces more 

 convex; marginal interspace not punctured except about the subhumeral 

 interruption of the eighth stria; shield wanting or small and inconspicuous. 

 The color may be described as yellow with the black standard spots broad, 

 those of the inner series more or less broadly and completeh^ confluent longi- 

 tudinally, the basal margin, tiji, two more or less disintegrated lateral spots 

 and numerous small discal spots, yellow. 



Pygidium and body beneath entirely black. Femora black and y(>llow, 

 tibiae and tarsi black, front tibiae often paler internally. 



Length 3.5 to 4.5 mm.; width 1.9 to 2.5 mm. 



Distribution. — California: San Diego, May; Pasadena, June; Mt. Wilson, 

 July; Placerville, May (Essig); Mokelumne Hill, May (Blaisdell); Dunsmuir 

 (Wickham); Blair's Ranch, Humboldt Co., June 19 (H.S. Barber), Los Angeles 

 Co. (Coquillett), and Santa Clara Co.( Koebele), all in the National Museum 

 Coll. Sobre Vista, Sonoma Co., July, Tuolumne Co., July, Mt. Tamalpais, 

 Marin Co., May 20, Shasta Co., Alameda Co., and Mt. Wilson, Los Angeles 

 Co. (Van Dyke Coll.). Lower California : Ensenada (Beyer). 



This species varies to almost entirely black, but I have not as 

 yet seen a specimen in which the yellow spots on the head were 

 entirely absent, or the legs entirely black. These black speci- 

 mens may be distinguished from the black form of californicus 

 (var. gagates) by the small front claws of the male and the more 

 distant ej^es, and generally also by the larger size. 



lis. Pachybrachys californicus new species 



Black, mottled with bright yellow, the yellow markings gen- 

 erally small and varying from many to few, or even (var. gagates) 

 none at all. Surface strongly shining, polished, without aluta- 

 ceous sculpture or rarely with tlic faintest trace of it. Ej-es (cf ) 

 separated by scarcely or barely the vertical width of their upper 

 lobes; front without ocular lines; front claws of male rather 

 strongly enlarged. Ave. length 3.2 mm. California and Arizona, 



Head moderately closely punctate, median line iinpressed between the eyes, 

 yellow with moderate to heavy black markings (or black with yellow markings). 

 Eyes separated in the male by about the length of the basal two joints of the 

 antennae, in the female by about two and one-half times the length of the 

 basal joint. Antennae slender, more than three-fourths the length of the body 

 in the male, the tenth joint three times as long as witle, black with several 

 of the basal joints yellowish, at least on the under side. 



Prothorax widest and rather strongly rounded at about the basal third 

 (variable), sides modei'ately convergent in front and distinctly rounded in 

 jjosteriorly, with a small but more or less evident sinuation before the hind 



TR.\NS. AM. EXT. SOC, XLI. 



