218 MEMOIRS ON THE COLEOPTERA 



narrowing near the apex, the first tergite (cf) with a medial carina 

 which projects posteriorly, the fifth fully one-half longer than the fourth, 

 with the usual small carinule at the middle toward base. Length (cf ) 

 3.0 mm.; width 0.65 mm. New York (Ithaca). 



Very distinct from the preceding and fusciceps in its longer an- 

 tennae, smaller head, less elongate elytra and other characters; 

 the pubescence is very short as in fusciceps. 



One of the more notable peculiarities of this genus is that the 

 male very much exceeds the female in size; in a series of five males 

 and six females of texana, before me, this is very marked, the male 

 being about two-fifths heavier than the female as can be seen at a 

 glance, with the head relatively smaller and the antennae longer 

 in the former sex; hence it might be thought that the above described 

 longicornis might be nothing more than the male of fusciceps. But, 

 on comparing the male and female of texana, I do not find strictly 

 similar sexual differences; for example, the general form of the body 

 differs but little in the two sexes of texana, while between longicornis 

 (cf) and fusciceps (9) the difference in the form of the body is 

 very great and the antennas differ much more than in the two sexes 

 of texana; in texana the elytra of the female are relatively smaller 

 and much shorter than in the male, but in fusciceps ( 9 ) the elytra 

 are narrower and more elongate than in longicornis (cf). So 

 there can be but little doubt that the latter two are distinct species. 



Gyronychina n. gen. 



The species in this group are smaller than in Gyronycha and 

 generally still more slender, with the elytra even more elongate, 

 the basal joint of the hind tarsi much shorter and the sexual char- 

 acters less accentuated and of a different kind ; it is peculiar to the 

 true Pacific coast fauna, but how far it extends to the northward 

 is not known at present. The type of the genus is Calodera at- 

 tenuata Csy., (Bull. Cal. Acad., I, p. 306). 



The sexual characters of this genus are quite different from those 

 of Gyronycha, as shown by a male and female of fenyesi Bernh., 

 originally described (Deutsche Ent. Zeits., 1906, p. 307) under the 

 name Aleuonota fenyesi. The male is materially larger than the 

 female, darker in color, with distinctly longer antennas and very 

 slightly more elongate elytra; but the tergum is wholly unmodified 



