156 GEO. H. HORN. M. D. 



CHRYSOMELID^E. 



CHKVSOC'HUS Redt. 



C robustus n. sp. — Brilliant metallic blue with a slight tinge of green, form 

 oval robust. Antennae piceous, basal joint blue. Head sparsely punctate. Thorax 

 about one-third wider at base than long, apex a little wider than the length, sides 

 feebly arcuate, surface very sparsely punctate. Elytra wider than the thorax, 

 widest at the humeri which are prominent, sides arcuately narrowing to apex, 

 surface irregularly, moderately coarsely and sparsely punctured. Body beneath 

 bright blue, as above, very sparsely punctate. Length .44 inch; 11 mm. 



This species is much more robust than either cobalt inns or aurafus. 

 In these the elytra are parallel, in the present species they narrow from 

 the base. The thorax in robnstus is wider from the apex to the base, 

 while in the other two species the sides are almost parallel po.^teriorly. 



Arizona, collected by Morrison. 



The three species may be correlated in the following manner : 



Sides of thorax subparullel posteriorly, the punctuation of the surface conspicuous. 

 Surface color brilliant cupreous or golden ; punctures of elytra arranged in con- 

 fused rows ail rat us. 



Surface color cobalt blue; punctures of elytra irregular cobaltiniis. 



Sides of thorax gradually wider from apex to base, the surface color blue with a 

 slight tinge of green robustus. 



Two other species have been described, californicus and tenehricosus 

 (Marshall, Proc. Linn. Soc. Zool. 18(54, p. 4'J), which are synonymous 

 with cohaltinus Lee. 



BRUCHID^. 



ZABROTES n. g. 



Head strongly deflexed in repose the mouth resting between the middle coxae. 

 Mouth as in Bruchus. Eyes finely granulated, feebly emarginate in front. An- 

 tenna: slender, as long as the entire body, subserrate. Thorax acutely margined, 

 base feebly lobed. Scutellum small. Elytra separately rounded at tip. Pygidium 

 vertical entirely exposed. Anterior coxae conical, prominent and contiguous, their 

 cavities closed behind. Middle coxae widely separated, the mesosternum nearly 

 vertical in front. Posterior coxae large, very narrowly separated at middle. Ab- 

 domen very short, not as long as the width of the coxae, the first and last segments 

 a little longer than the others, the intermediate segments linear. Tarsi as in 

 Bruchus, the claws simple. Anterior and middle tibiae without spurs, posterior 

 tibiae with two long movable spurs and finely spinulose on the inner side. Form 

 robust, quadrate, body winged. 



The most striking differences between this genus and Bruchus are 

 found in the simple claws, movable hind tibial spurs, acutely margined 

 thorax and widely separated middle coxae. From Spermophagus as rep- 



