266 MEMOIRS ON THE COLEOPTERA 



the tibiae, with the second joint distinctly more than twice as long as 

 wide. Length (cT) 23.5 mm.; width 6.5 mm. Honduras. 



Differs from asperatus in its much less transverse prothorax, less 

 than half as asperate pronotum and much longer tarsi, also in having 

 the eighth antennal joint only half as long as the seventh and 

 proportionally thinner than in that species. This can hardly be 

 the form alluded to by Bates (Biol. Cent.-Amer., Col., V, p. 239) 

 from Chiapas, Mexico, as agreeing precisely with Nebraskan 

 specimens of asperatus. 



Criocephalus filitarsis n. sp. Smaller and more slender than asperatus, 

 similar in color and punctuation, black and rather dull throughout; 

 head as in asperatus, except that the eyes are less transverse and less 

 widely separated; antennae (9) shorter and more slender, otherwise 

 nearly similar, the second joint just half as long as the third; prothorax 

 smaller and less transverse, prominent and narrowly rounded at the sides 

 well behind the middle, the sides thence but feebly converging, being 

 almost parallel for a short distance, then broadly rounded to the apex, 

 which is fully as wide as the base; surface not impressed medially, having 

 a moderate shining impression near each side and a deep rounded pit 

 medially near the base, having toward the sides a very few small and 

 widely dispersed shining tubercles; elytra much wider than the prothorax, 

 narrowed but very slightly from base to the circularly rounded apex, the 

 sculpture as in asperatus, except that the sublateral raised line is also 

 evident; legs shorter and much more slender, the hind tarsi extremely 

 slender, two-thirds as long as the tibia, the second joint nearly three 

 times as long as wide, the third almost twice as long as wide. Length 

 (9) 20. o mm.; width 5.3 mm. Texas (El Paso), Dunn. 



This species differs greatly from the allied asperatus in its smaller 

 size, slighter build, much less impressed and very much less asperate 

 prothorax which has a different outline, the apex being narrower 

 than the base in that species, and more particularly in the very 

 slender tarsi and in the form of the fifth abdominal segment above 

 and beneath, which is much narrower and relatively longer in 

 filitarsis. 



Criocephalus cavicollis n. sp. Smaller in size than the preceding and 

 with relatively smaller head and prothorax, nearly similar in its very 

 dense punctuation and the raised lines of the elytra but somewhat more 

 shining, dark piceous-brown throughout; head smaller, the median line 

 only finely impressed, the eyes separated by over three-fourths more than 

 their width; antennae (cf) very slender, more than two-thirds as long as 

 the body, the third joint fully twice as long as the second, the eighth 

 about three-fourths as long as the seventh and only very slightly thinner; 

 prothorax nearly one-half wider than long, the sides rather prominent 

 but narrowly rounded well behind the middle, thence distinctly converg- 



