140 GEO. H. HORN, M. D. 



Female. — The anterior and middle tarsi are nearly as widely dilated as the 

 male, the first three joints hairy beneath, the fourth less hairy. Anal segment 

 each side bipunctate. 



This is the largest species in our fauna and the only one without any 

 trace of metallic surface lustre. The general appearance at first sight 

 recalls the bicolor variety of Platynus brunneomarginatus or Pinacodera 

 platicollis. It is probably closely allied to C. brunnea Dej., from the 

 vicinity of the City of Mexico, the female is however described as having 

 the tarsi spongy beneath. 



Occurs in the mountains east of Yisalia, California, also in south- 

 western Utah. 



It is remarkable that California should furnish two brownish species in 

 adjacent genera in which all the other species are more or less metallic. 



C. plan ii lata Lee. — Form moderately elongate, pieeous, elytra with cupreo- 

 violaceous surface lustre, the sides slightly greenish. Head smooth, front vaguely 

 impressed each side. Antennae brownish. Thorax about as wide as long, broadest 

 at middle the sides arcuate, very slightly sinuate in front of the hind angles which 

 are rectangular, lateral margin slightly reflexed, very narrow in front, gradually 

 wider posteriorly, disc slightly convex, the median line broadly and deeply 

 impressed, surface slightly wrinkled laterally and with a few punctures at apex, 

 along the median line and at the sides. Elytra oblong-oval, rather deeply striate, 

 the strise very finely punctured, intervals convex and with very few punctures. 

 Dorsal punctures as in the preceding species. Body beneath pieeous, shining and 

 nearly smooth. Length .44 inch; 11 mm. 



Male. — Unknown. 



Female. — Anterior tarsi slightly dilated, the first four joints spongy beneath. 

 Middle tarsi less dilated, first joint hairy the next three spongy. Anal segment 

 with four punctures each side. 



I have seen but one specimen, that described by Dr. LeConte from 

 the Berlandiere collection the localities of which are not accurately stated. 

 The specimen may have been taken in Mexico or Texas. 



Chaudoir (Annales Belg. 1872, p. 120), describes C. metallescens from 

 Vera Cruz, Mexico, which may be identical with planulata. 



C. % iridipeiinis Say. — Form elongate, color bright bluish-green, elytra 

 usually margined with cupreous. Antennas pieeous, three basal joints paler. 

 Legs pieeous. Vertex smooth, front impressed each side and rugulose. Thorax 

 a little longer than wide, sides very feebly arcuate, widest a little in front of 

 middle, margin narrow, a little wider posteriorly, hind angles rectangular not 

 prominent, disc moderately convex, median line impressed, a little deeper pos- 

 teriorly, surface very sparsely punctulate and obsoletely wrinkled. Elytra oblong, 

 the sides very feebly arcuate, disc striate, the stripe very finely punctulate, inter- 

 vals slightly convex, obsoletely sparsely punctulate. Body beneath pieeous with 

 slight metallic lustre, surface nearly smooth. Length .36 — .40 inch; 9 — 10 mm. 



Male. — Anterior tarsi moderately dilated, the first three joints biseriately Lamel- 

 late beneath, the fourth joint spongy. Middle tarsi less dilated, similarly clothed. 

 Anal segment with one puncture each side. 



