lO^A ACADEMY OF SCIENCES. 189 



long by 2 mm. broad, slightly narrowed in front of the eyes, 

 widening immediately to a spoon- shaped tip, which is thin and 

 slightly reflexed. The body color is bright green with four 

 equidistant parallel lines extending ever head, thorax and scu- 

 tellum; the nerres of the elytra and the ovipositor orange red. 



The males are quite different from the females in appearance, 

 and were described by Professor Uhler as Glossocratus fenes- 

 traius, and have hitherto been regarded as a distinct species. 

 They are much smaller, measuring scarcely 8 mm. to the tip of 

 the style-like pygofers. 



The head, thorax and basal part of the elytra are marked 

 like the female, but the ground color approaches orange. The 

 apical half of the elytra and the abdomen are quite different. 

 There is a narrow black band just back of the middle of the 

 elytra and a broader terminal one, between these is a hyaline 

 area with a small curved dark spur extending in on the center 

 of the outer margin. The abdomen is annulated with black, 

 and the terminal segment, valve and attenuate plates black. 



The larvae are narrow, elongate, closely resembling the female 

 in color and in the stripes which extend along the abdomen also. 



The species has been reported from Kansas and New Jersey, 

 including only a few specimens in all. There was a specimen 

 in the VanDuzee collection from New York, and one specimen 

 had been taken afc Ames and another at Batavia, Iowa. 



The larvae were found on an isolated patch of slough grass 

 {Spartina cynosuroides) early in August. They were then nearly 

 full grown. 



The adults were taken in coitu in the middle of August, and 

 from then on through September were found in some numbers 

 on the limited patch where their food plant occurred. 



It is highly probable that the eggs were deposited in the 

 stems of the slough grass before the middle of September, in 

 which case the ordinary time of mowing would be an effectual 

 remedy, and would account for the rarity of the species in cul- 

 tivated areas, or in sections annually overrun by prairie fires. 



PARABOLOCRATUS VIRIDIS UHL. 



(PI. xxl, Fig. 1.) 



Olossocratus viridis, Uhler, BuU. U. S. Geol. and Geog. Surv., Ill, p. 462, 1877. 

 Parabolocratua viridis, Uhler, Stand. Nat. Hist. II, p. 247, 1884. 



Occuring only on the wild oat {Stipa spartea) this species 

 furnishes another example of a jassid confined strictly to one 

 species of grass as a host and one to which it is remarkably 

 adapted in coloration and life history. 



