PROCEEDINGS OF THE AMERICAN ACADEMY. 



10 ( t. -2 9. South Park, Col., Aug. 11-16; Garland, ( ol., Aug. 

 29, collected by myself. 



- Derotmema lichenosum. Bp. qot. 



Of relatively larg >-ciuereous, much marked with fuscous 



and ferruginous. Head not very prominent, the face much mottled with 

 cinereous and fuscous, generally darker above the . the fastigium 



and frontal costa much as in the I '-1 species; 1 l\ moderately 



prominent even in the male; antennae ahoul as long .-.- (J) or much 

 shorter than (9> the himl femora, ferruginous, distinctly banded with 

 fuscous. Pronotum cinereo-fuscous, often flecked or blotched with bright 

 ferruginous (simulating the rusty lichens of the »rush) on the disk, 



the lateral lobes with markings similar to th the last speci 



lateral carina' sharp and distinct, at least on the metazona, the disk of 

 which is granuloso-rugose, its posterior margin rectangulate, ran 

 feeblv obtusangulate. Tegmina 9haped as in Trimerotropis, with arched 

 costa. cinereous, marked with fuscous nearly uniformly distributed in 

 slender streaks and patches, showing a decided longitudinal tendency, 

 especially in the distal three fourths where they follow interruptedly tie- 

 course of the longitudinal veins; occasionally an obscure tendency is 

 seen to their grouping basally, as common in Trimerotropis; the inter- 

 calary vein approaches the median much more closely than it does the 

 ulnar vein ; wings marked quite as in the last species, the hand as there 

 reaching the hind margin but not the anal angle, and leaving three lobes 

 of the radiate area free : but they are of the normal form, not full in the 

 radiate area and rarely more than four sevenths as broad as long. 

 Hind femora cinereo-tesl . rather obscurely fasciate with fuscous. 



Length of body, $, 21 ram., ?. 26.5 mm.; antenna'. £, 10.5 mm.. 

 9. in nun.: tegmina, $, 2-1 mm.. 9. 28.25 mm.; hind femora, <£ , 

 10.7") mm., 9, 13 mm. 



40 A 11 9- Alkali, "Wyo., July 27 ; Green River, Wyo., July 21- 

 31; between Green River and Evanston, Wyo., Jul\ 31; Evanston, 

 Wyo., Aug. 6; Fossil, Wyo., Sept. 2; Castle Gate, Utah, Aug.! 

 White River, Col., at the Utah border, July 24 Vnj. 13; Florissant, 

 Col., Aug. 17 22; South Park, Col., Aug. 11-16; Garland, ( 

 Aug. 28 29, all collected by myself. 



The species was much more commoi in the northern of these localities 

 than in the' southern, and was found on and about the Bage-brush, its 

 colore rend' riii'': it most inc mspicuous and bo me times Bhowing, especially 

 upon the I :asionally upou the head, rusty patches <piite 



