390 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Length of body, J*, 14 mm., 9, 22mm.; antennae, J', 11 mm., 9, 

 9 mm. ; tegmina, ^ , 16.5 mm., 9> 22.25 mm. ; hind femora, $, 9 mm., 

 9,12 mm. 



30 (? , 28 9 . Las Cruces, N. Mex., T. D. A. Cockerel], C. H. T. 

 Townsend ; Mesilla, N. Mex., June 30, A. P. Morse ; Phoenix, 

 Ariz., Oct. 16, T. D. A. Cockerell ; B^ort Whipple, Ariz., E. Palmer ; 

 forty miles east of Tucson, Ariz., E. Palmer. 



Mr. A. P. Morse found this species common at Mesilla on dry soil, 

 especially on sandy ground. It flies freely and is not easily caught. 



2. Derotmema delicatulum, sp. nov. 



Of relatively small size, pallid testaceous, occasionally tinged with 

 rufous, flecked more or less with fuscous. Head with the face often 

 hoary in the male, with prominent subglobose eyes, occiput, fastigium 

 and frontal costa exactly as in the last species; antennae as long as (J) 

 or considerably shorter than ( 9 ) the hind femora, pallid, interrupted with 

 fuscous, Pronotum testaceous, often more or less rufescent in female, 

 flecked more or less with fuscous, somewhat selliform especially in the 

 male, the metazona broad, generally broader, especially in the female, 

 than at the eyes, its posterior margin very broadly rounded, but 

 occasionally showing signs of angulation mesially, the disk nearly 

 smooth but generally with raised points and occasionally slightly rugose 

 in the male, distinctly and rather sharply rugose in the female, the lateral 

 carina? rather distinct but fading on the prozoua. Tegmina slender and 

 tapering, marked as in the last species and with similar intercalary vein ; 

 wings pale citron yellow at base, hyaline apically, with a slight infuscation 

 of the veins at extreme apex and a narrow and somewhat cloudy 

 extramesial fuscous band, narrower than the metazona, almost completely 

 interrupted in the axillary area though sending in its upper portion a 

 short shoot toward the base, and by a trifle failing posteriorly to include 

 the hind margin, leaving at least four lobes of the radiate area free. 

 Hind femora cinereo-testaceous, obliquely and obscurely fasciate with 

 fuscous. 



Length of body, $, 14 mm., 9 5 22 mm.; antennas, (^ , 8.75 mm., 

 9, 9 mm. ; tegmina, $, 15.5 mm., 9? 21 mm.; hind femora, J* , 

 8.75 mm., 9, 12.5 mm. 



5 cj , 3 9- Lancaster, Cal., July 31, A. P. Morse; Mohave, Cal., 

 Aug. 1, A. P. Morse; between Gila Bend and Yuma, Ariz., July 4, 

 A. P. Morse. 



