56 CASEY 



Tarsi longer and more slender, the basal joint fully as long as the next two 

 or longer, as in Gyascutus; abdomen with the basal segment a little 

 longer, the first suture similar but better marked Prasinalia 



The latter of these subgenera seems to be peculiar to the fauna of 

 Arizona and the adjacent parts of California, where it replaces Hippo- 

 melas, which is widely diffused from our southern boundaries to 

 southern Mexico. 



Hippomelas in sp. 



Legs very thick, the tarsi unusually short, the basal joint of the posterior 

 but little longer than the second. Body moderately narrow, convex, 

 subcylindric, cupreous in lustre, the elytra more aeneous, the epipleurae 

 and sides of the under surface becoming greenish; head ( c?) much more 

 depressed throughout the frontal surface and vertex than in any other 

 species, feebly concave, hairy, more finely and uniformly sculptured and 

 green from the occiput to the strong antennal ridges; outer antennal 

 joints parallel; prothorax two-fifths wider than long, moderately trape- 

 zoidal, the sides straight; apex feebly arcuate except laterally, the base 

 broadly bisinuate; surface moderately strongly, subevenly and sparsely 

 punctate, more closely laterally and with feebly marked and more 

 convex vacant spaces throughout, the lateral margin green; scutellum 

 small, transverse; elytra slightly wider than the prothorax and three 

 and one-half times as long, the sides feebly converging from the humeri 

 to about apical third, thence rounding and with long, ver}^ feeble ser- 

 rules to the apices, which are narrowly and deeply emarginate and 

 briefly bidentate; surface even, with barely impressed striae of fine close 

 punctures, becoming larger and closely confused at the sides; intervals 

 scarcely punctate, somewhat creased; under surface sparsely punctate, 

 polished, bright coppery, the legs and lateral parts unusually pubescent. 

 Length 23.0 mm. ; width 7.5 mm. Mexico (Guerrero) . *brevipes n. sp 



Legs less thick, the tarsi less abbreviated, the basal joint of the posterior 

 almost as long as the next two combined as a rule 2 



2 — Body stouter in form, always black or blackish and seldom with notice- 

 able metallic lustre. Sonoran regions 3 



Body narrower, decidedly slender though convex and subcylindric, bright 

 metallic in lustre; third antennal joint much shorter, but little longer 

 than the fourth. Southern Mexico 6 



3 — Elytra with very feeble aeneous or greenish-metallic lustre 4 



Elytra deep black or piceous-black, without trace of metallic lustre 5 



4 — Form elongate-oval, convex, stout, moderately shining, the hairs of the 

 elytra very short and sparse, dense and longer as usual at the finely 

 punctate basal margin, also unequally on the head, the legs very sparsely 

 pubescent; head large, with large irregular elevated smooth areas which 

 are separated by aeneous depressions, the latter densely and rather finely 

 punctate; antennae moderate, the third joint unusually elongate; pro- 



