H. C. FALL 373 



57. Pachybrachys fortis new species 



Large, robust, yellow, with standard markings, in pale brown, 

 rather lightly indicated on the elytra; lustre dull, surface with 

 very fine, short and sparse pubescence; no ocular lines; front 

 claws of male rather large. Ave. length 4.7 nun. Southern 

 Arizona. 



Head flat, impressed along the median line, densely punctate in the large 

 dark areas, with smaller yellow subimpunctate spots. Eyes separated by from 

 one-fifth to about one-third more than the length of the basal antennal joint in 

 the male, and b}' rather more than twice the length of this joint in the female. 

 Antennae very slender, fully three-fourths the length of the body in the male, 

 and passing the middle in the female; outer joints blackish, the tenth more 

 than four times as long as wide. 



Prothorax widest at about basal two-fifths, sides nearly straight and moder- 

 ately convergent in front, a little convergent behind and with a slight sinuation 

 before the hind angles; punctuation fine, dense in the more heavily shaded 

 areas, sparse in the unshaded portions but extending to the side margins; 

 basal portions of the M broadly distinct, the apical portions lighter and evanes- 

 cent anteriorly. 



Elytra fully twice as long as the prothorax and more coarsely punctured; 

 punctures confused in the baso-sutural region, elsewhere generally serially 

 arranged, the striae in part entire, in part interrupted, notably striae four to 

 six in front of the middle; eighth stria sinuate behind the humerus; marginal 

 interspace with numerous punctures in basal half; shield small or nearly want- 

 ing. 



Pycjidiuni Ijrown and yellow; body beneath brown, with abdominal apex 

 pale. Legs pale, with median darker shades on both femora and tibiae. 



Length 4.5 to 5 mm.; width 2.3 to 2.75 mm. 



Distribution. — Arizona: Xogales, 4,000 ft., Aug. 15 (Xunenmacher). Type 

 (male). 



Two males and one female of this fine species are before me, 

 for which I am indebted to Mr. Nunenmacher, in whose collec- 

 tion are further specimens. It is most likely to be confused with 

 crassus and has been referred to under that species. The ej'es 

 are more approximate in crassus, nor have I seen any indication 

 in that species of the short pubescence which is noticeable in all 

 of the specimens oi fortis. In crassus the serial punctures along 

 the side margin of the prothorax are imcolored or nearly so and 

 from sixteen to nineteen in number, while in fortis these punc- 

 tures are brown and al)Oiit twenty-three in number. I have for 

 the present associated two smaller females takcMi also at Xogales 

 by Mr. Nunenmacher. These are three and three and one-half 



TR.\NS. .■VM. ENT. SOC, XLI. 



