H. C. FALL 367 



50. Pachybrachys chaoticus new species 



Robust, yellow, brown punctate and with ratiier sharph- de- 

 fined brown markings; eyes narrowl}- separated, front without 

 ocuhir lines; punctuation throughout sparse and irregular; front 

 claws of male strongly enlarged. Ave. length 3.8 nnn. Arizona. 



Head with few punctures except in the dark median Hne and vertex spot. 

 Eyes separated in the male by barely the length of the basal antcnnal joint, 

 and by about one and one-half times the length of the basal joint in the female. 

 Antennae verj' slender, nearly the length of the body in the male, the tenth 

 joint four times as long as wide. 



Prothorax rather large, sides arcuately convergent from near the base to 

 the front angles, rounded in a little at base, without evident sinuation before 

 the angles; markings sharply defined and consisting entirely (in the type) of 

 aggregations of brown punctures roughly forming the thoracic M, the remain- 

 ing portions of the disk with sparse scattered punctures, the side margins 

 broadly subimpunctate. 



Elytra very irregularlj'- and sparsely punctate, with broad impunctate spaces, 

 the eighth stria entire but strongly sinuate, the others scarcely evident except 

 for their short apical portions on the posterior convexity; shield large, rounded; 

 marginal interspace impunctate; standard spots distinct, rather small, the 

 two posterior ones of the inner series confluent. 



Pygidium brown and yellow, body beneath brown, abdominal apex pale. 

 Legs yellow, with median brown shades on the femora and tibiae. 



Length 3.4 to 4.2 mm.; width 2.1 to 2.35 mm. 



Distribution. — Arizona: The male type was given me years ago by a non- 

 entomological friend who took it if I am not mistaken near the Colorado 

 River. The above description is drawn from the type, but I have since seen 

 a female from the Rincon Mts. (5,000 ft., July) in Mr. Beyer's Collection and 

 a pair from Oracle (July 6 to 15) in the Hubbard & Schwarz Collection. These 

 do not necessitate any change in the original description except as to measure- 

 ments of length and width, the original male being smaller than any of the 

 specimens subsequently seen. 



51. Pachybrachys peltatus new species 



Yellow, wdth sharply defined but not very heavy black mark- 

 ings, surface minuteh' alutaceous but somewhat shining. Pro- 

 thoracic M entire; elytra with the inner row of standard spots 

 irregularly confluent and surrounding the large orbicular yellow 

 shield, which is very conspicuous. Front without ocular lines; 

 claws of front tarsi obviously though not strongly enlarged. Ave. 

 length 3.25 mm. Lower California; Mexico. 



Head not wider than the thoracic apex, front feebly convex, rather sparsely 

 and finely subevcnly punctate; color largely yellow, a short median line and 

 small vertex spot fuscous. Eyes separated in the male by a distance subequal 

 to the length of the first two antennal joints, or by a little less than the 



TRANS. AM. ENT. SOC, XLl. 



