66 



the disk and middle portion of the sides black. There is a paler irreg- 

 ular stripe on the sides. Sides of the meso and metathorax black. 

 Elytra brownish, semi-transparent; an indistinct rufous stripe along the 

 iuteruo-mediau nerve, most distinct near the base. All the legs pur- 

 plish brown ; the under side of the posterior femora yellowish. Venter 

 and pectus yellowish. 



Dimensions. — Length, 0.70 inch; elytra, 0.50 inch; posterior femora, 

 0.35 inch; posterior tibise, 0.33 inch. 



iSTamed in honor of Lieut. W. L. Carpenter, who discovered it near 

 the Mountain of the Holy Cross, in Colorado, at an elevation of 8,000 

 to 10,000 feet above the sea. 



Bemarlis. — This species is exceedingly interesting, as showing the 

 strong tendency of similar conditions to produce similar forms. The 

 Stenobothriis ( Gomphocerus ) sihiricus is a peculiar form occuring only iu 

 the higher mountains of Europe and extreme northern portions of Europe 

 and Asia. Here we find the same abnormal characters (enlarged front 

 tibife and gibbous pronotum) occurring under exactly similar conditions ; 

 i. e., in the higher mountain-portions of Colorado iii the vicinity of per- 

 petual snow. 



Thrincus caJifornicus, sp. nov. 



5 . Small size, bright reddish-brown, with fuscous dots. Head very 

 short, drawn back in the pronotum nearly to the eyes ; occiput veiy short, 

 a slight tubercle each side near the upper canthus of the eye. Vertex 

 rather broad, but not transverse, very slightly deflexed, not expanded 

 in front of the eyes ; margins elevated, sharp, parallel between the eyes, 

 meeting in a subacute angle in front; lateral foveola3 minute, triangular. 

 Frontal costa narrow at the apex, expanding at the ocellus, but solid 

 immediately above the ocellus margins carinate above the ocellus; 

 lateral carina distinct, bending forward somewhat angularly opposite 

 the antennae ; lower portion diverging toward the corners of the face. 



Pronotum short, expanding rapidly posteriorly, rugose, tuberculate ; 

 median and lateral carinse indistinct except on the front part of the pos- 

 terior lobe, and there they are obtuse ; the transverse incisions are not 

 distinguishable except the posterior one, and this only on the sides, 

 where it forms an irregular tortuous indentation ; a somewhat prominent 

 and slightly elongate tubercle on the front margin immediately behind 

 each eye; two somewhat prominent tubercles on the disk close together 

 at the front margin of the posterior lobe; the disk of the posterior lobe, 

 although flattened, is somewhat elevated, and covered with elongate 

 tubercles ; posterior margin right-angled, rounded at the tip, mar- 

 ginate. 



Elytra extend a short distance beyond the tip of the abdomen; rounded 

 and curved upward at the extremity. Posterior femora short, not reach- 

 ing the extremity of the abdomen, considerably inflated, and thick toward 

 the base, but the upper and lower cariuse not prominent ; disk convex; 

 pinnsB prominent and minutely hairy. Antennae rather short, not reach- 

 ing the extremity of the pronotum, not subacuminate (as shown by 

 Fischer) but slightly flattened toward the apex, filiform. 



Color. — A bright reddish-brown, with but few fuscous dots and mark- 

 ings as follows: Four or five spots along the disk of the elytra; a few 

 smaller ones in the lower field; and two double short bands across the 

 upper field. (Wings not spread, but appear to be yellowish at the base 

 and fuscous at the apex). Posterior tibiae greenish or pale-blue; tarsi 



