328 BULLETIN 63^ UNITED STATES NATIONAL MUSEUM. 



pronotal disc is less coarsely punctured. These remarks apply 

 especially to the Arizona or elongate form of snowii. 



I have seen a few specimens that were rather ovate in form, with 

 the elytra showing a tendency to become less elongate and wider than 

 the prothorax. Such variations are expected and must be recognized. 



General observations. — The mentimi is usually quite parabolic in 

 outline, sometimes subtriangular ; surface very slightly convex, not 

 coarsely but quite densely punctate laterally, where it is sometimes 

 subfoveate; the punctures are not noticeably setigerous. 



The prosternum is variable, more or less prominent ventrally with 

 the coxse, and moderately widened behind the axes of the acetabula, 

 frequently grooved at the middle. In the more strongly developed 

 individuals it is horizontal between the coxae and mucronate behind; 

 in others, arcuate antero-posteriorly and with a more or less well- 

 developed mucro at the middle of the posterior border; again, it is 

 evenly arcuate and not at all mucronate. 



The mesosternum is vertically arcuate, or more obliquely so, deeply 

 concave, appearing somewhat l)ilobed ; the concavity varies in depth. 



The metasternum laterally between the coxae is as long as the 

 width of a protibia at apex. 



The abdominal process is quadrate and about a fourth of its width 

 wider than the metasternal salient, and equal in length to the post- 

 coxal portion of the first segment; also about equal to the length of 

 the second segment (male). 



In the male the second segment is one-half longer than the fourth, 

 and the third about a third longer than the same segment. In the 

 female the second is twice as long as the fourth and about a fourth 

 longer than the third. 



The tarsi are moderate in length and somewhat stout. 



The protarsi are about two-fifths (male) to three-eighths (female) 

 of their length shorter than a mesotarsus. 



The mesotarsi are about a seventh (male) to an eleventh (female) 

 of their length shorter than a metatarsus. 



The metatarsi are about three-eighths (male) to two-thirds of their 

 length shorter than a metatibia. 



ELEODES TENEBROSA var. NANA, new. 



As in tenehrosa., except smaller, more strongly and densely sculp- 

 tured. Sides of the pronotum slightly tuberculate, margin more 

 strongly sinuate before the basal angles. Elytral tubercles larger and 

 more distinct, more evidently setigerous at the sides; humeri obtuse, 

 scarcely rounded to subrectangular, with the epipleural margin often 

 visible at the angle. 



Measurements. — Males: Length, 10,5-12.5 mui.; width, 5-5.5 mm. 

 Females: Length, 12 mm.; width, 6 mm. 



