48 Journal New York Entomological Society, t^oi. xxiii. 



obtuse, not acute and the antennal joints and the elytra are relatively 

 shorter than in rubcns. 



T. chalybcriis, of which I have specimens from Alaska, British 

 Columbia, California and Whiteface Mt., New York, differs from T. 

 borealis in having slightly larger and more convex eyes, the hind 

 angles of prothorax acute and nearly rectangular, the base of thorax 

 straight, not oblique each side, and generally only the first three 

 elytral stride impressed. It is also reported from New Jersey but 

 I doubt the correctness of the determinaion as my New Jersey speci- 

 men is T. borealis. 



The specimens of T. chalybccns in my collection from the above 

 mentioned localities show inter se very little variation, however, there 

 are two forms, one from Utah and one from Colorado, which differ 

 sufficiently to receive a name as varieties of T. chalybccns. 



Trechus chalybaeus var. utahensis new variety. 



This form, collected by J. Chr. Weidt in southwest Utah, is larger 

 (15.5 mm.) and a little more convex than chalyhcrus but has the 

 elytral striae as in riibens and borealis, that is, five distinctly impressed 

 striae with the sixth and seventh feebly impressed, but the latter more 

 prominent than in typical chalybccns. The form of thorax and the 

 prominent eyes as in chalybccns. 



Trechus chalybaeus var. coloradensis new variety. 



This form, from Colorado, has the thorax almost as in typical 

 rnbens, that is, relatively longer and the lateral margin behind middle 

 somewhat sinuately narrowing to the basal angles, which are acute 

 and a little prominent, the elytra and eyes as in typical chalybccns. 



Trechus barbarae Horn. 



Dr. Horn in his description of this species states that the dorsal 

 pnunctures of elytra are as usual. Having only a single specimen 

 at the time I wrote the synopsis, I suggested that the five or six 

 setigerous punctures on each elytron of the specimen kindly loaned 

 me by the late Charles Fuchs and figured on plate 28, Vol. XIV of 

 Bull. Am. Mus. Nat. Hist., are possibly abnormal. However, a second 

 specimen, which I have seen lately, has also on each elytron an 

 irregular row of five or six setigerous punctures. 



