H. C. FALL 401 



Didribidiou. — Cdlifuruiu: Huniholdt Co., May ami .luiip (Xunenmacher); 

 Blair's Ranch (H. S. Barber); Dunsinuir (Wickhainj; Sylvania and Los Gatos 

 (Hubbard & Schwarz); Santa Cruz Mountains (Xat. Mus.); Santa Clara Co. 

 (Koebelc — Nat. Mus. Coll.); Sonoma Co., Lake Co., Vine Hill, Contra Costa 

 Co. (Blaisdcll); San Bernardino Mountains, G,400 ft., Aug. (G. R. Pilate); So. 

 Cal. (Hopping). Mannerheim's tyi)e is recorded from "California" simj)ly. 



83. Pachybrachys signatus Bowditcli 



Yellow, with l)hi('k or brown markings somewhat variable, 

 typically with a broad median thoracic stripe, narrowly divided 

 in front, and with the side arms of the IVI more faint 1\' indicated; 

 el,ytra with a discal U shaped mark with the arms resting on the 

 middle of the base and crossing the suture just before the shield; 

 posterior standard spots fused into a transverse fascia; eyes 

 separated by fully twice the length of the basal antennal joint in 

 the male, and by three times the length of this joint in the female, 

 ocular lines distinct; front claws of male a little enlarged. Ave. 

 length 2.8 mm. Arizona to western Texas. 



The essential characters are, as will be seen, \ii-tually those of melanosticlus; 

 the maculation, however, is more speciahzcd and the posterior elytral fascia 

 together with the median thoracic stripe constitute its most peisistent and 

 typical features. The middle and anterior standard sjjot.s of the elytra arc 

 frequently faint or wanting, the frontal spots are small and i)ale, that on the 

 vertex usually well marked. The eyes are a little more ])rominent than in 

 melanostictus, the front is rather closely jjunctate, the elytral striae are as a 

 rule a bit more regular, the fifth and sixth less liable to be confused; legs y(>llow 

 with small and often faint femoral spots; th(> antennae more conii)let(>ly yellow 

 than in melanosticlus. 



Disiribulion. — Arizona: Prescott, tyi)e; Tucson, May 6 (Hubbard & 

 Schwarz); Phoenix (Am. Ent. Soc. Coll.); "Ari" (Nat. Mus. Coll.). Ulah: 

 Mill Creek, June 16 and Am. Fork, June 24 (Hubbard & Schwarz). Xcw 

 Mexico: (Snow Coll.). Texas: Davis Mountains, July 8 (Wenzel). 



Signatus is closely related to nielanosdctus and most of the 

 distinguishing characters mentioned above are really of little 

 weight. It is exactly intermediate between melanostictus and 

 livens, antl a])])ears to be (piite as close to tlie latter, with which 

 it nearly agrees in the slightly prominent eyes and general form 

 and sculpture. In livens the middle thoracic stripe is rarely 

 divided in fr(_)iit by a ])ale line, the lateral thoracic shades are 

 almost or quite wanting, the elytra are immaculate and the front 

 claws of the male are only just ])erceptil)ly larger than the others. 

 Specimens of /nelanostictus with the rear elytral spots suffused 



TUAXS. AM. ENT. SOC, XLI, 



