ART. 2 REVISION OF TRIEHABDA NORTH OF MEXICO BLAKE 35 



I have not dissected Derospidea, ornata^ as only the type specimen 

 is known, but H. S. Barber kindly dissected for me the single speci- 

 men of Gya7ieomaculata in the United States National Museum col- 

 lection. The aedeagus is strikingly like that of hrevicollis in shape. 

 All three species are similar in having glabrous heads and in the 

 shape of the markings on the pronotum. The faint pronotal spot- 

 ting of ornata^ overlooked by Schaeffer, resembles that of the more 

 weakly marked specimens of hrevicollis, particularly in the traces 

 of the Y-shaped median spot. 



1. CORAIA SUBCYANESCENS (Schaeffer) 



Plate 2, Figure 26 



Trirrliadda subcyanescens Schaeffer, Brooklyn Inst. Mus. Sci. Bull., vol 1, 

 no. 9, p. 241, 1906. 



Description. — Stout, parallel, coarsely punctate, not shining, light 

 rufous with wide metallic-green spot on occiput, prothorax with 

 three large piceous spots, elytra deeper reddish with variable green 

 metallic luster, sometimes confined to humeri, scutellar region, and 

 suture, sometimes over entire elytra. Head slightly produced 

 frontally by dark tubercles above base of antennae; coarsely and 

 rugosely punctate, with thick pubescence; a wide oblong dark spot 

 over occiput and down front, with greenish luster. Antennae 

 robust and dark, longer and stouter in male, and in both sexes hav- 

 ing the basal, third, and fourth joints subequal. Prothorax not 

 quite so broad as long, subquadrate, with nearly straight sides, as 

 viewed from above; alutaceous with dense, almost rugose punctures 

 over greater part, and densely pubescent; three large black spots, 

 the lateral ones covering margin. Scutellum, sometimes entirely pale, 

 again darkened apically. Elytra densely and coarsely punctate and 

 moderately pubescent, reddish with green luster, sometimes more 

 marked on humeri, about scutellar region and suture, and some- 

 times evenly distributed over elytra. Body beneath reddish with 

 sides of metasternum, a spot on femora, and tibiae and tarsi dark. 

 Outside edge of tibiae conspicuously smooth, shining, and ridged 

 in basal portion with sulci on either side of the ridge. Length, 7.5 

 mm. to 8 mm. ; width, 3.8 mm. 



Type locality. — Brownsville, Cameron County, Tex. 



Distnl)ution. — Texas (Edinburg, Harlingen, and Brownsville). 



Food plant. — Unknown. 



Remarks. — Clark differentiated this genus from related genera 

 by its subquadrate thorax, its long robust antennae, the third and 

 fourth joints of which are equal, and its parallel body. It is stouter 

 and more heavily chitinized than Trirhahda, and the head is slightly 

 produced frontally. The difference in the antennae in the two sexes 

 is also peculiar to this in contrast with related genera. The shape 



