1894.] HEMIFrEBA-HETEROPTEBA OF GREKADA. 213 



found on the JMirabeau estate, at "Woburn and at St. George's, on 

 the surface of streams of water, as also on springs of water. 



In the unwinged form the scutellum is not distinctly differ- 

 entiated, but in the winged one it is covered by the valvular end 

 of the pronotum. 



This species has an extensive distribution from south to north. 

 It occurs at Eio and at other places near the coast of Brazil, but 

 the most northern limit at present known for it is the island of 

 St. Vincent. IVo specimens have yet been obtained in Cuba, and 

 I did not discover it in the island of San Domingo, where ray 

 work was particularly directed to obtaining the insects from the 

 springs and streams of fresh water, both of the highlands and the 

 coast. The close collecting of Prof. Poey and Dr. Gundlach, 

 throughout a period of more than forty years, should have secured 

 this insect if it existed in Cuba, but no specimens have been re- 

 ported by either of those gentlemen. 



It varies somewhat in colour and degree of marking upon the 

 head, pronotum, and sides. The medial carina and transverse 

 impression are not absent, as stated by Dr. Mayr (Novara-Reise 

 p. 178) ; but the slender cariua is not always very distinct, aad it 

 is rendered much less conspicuous through simulating the colour 

 of the surface. 



Teepobates, Uhler. 



Tbepobates picttjs (H.-Schf.). 



Halohates pictv^, H.-Schf. Wanz. Ins. viii. p. Ill, t. cclxxxvi. 

 figs. 882, 883. 



Stephania picta, B.-White, Challenger Eep., Zool. vii. pt. 19, 

 p. 79. 



Several varieties of this species, precisely like those which are 

 common in Maryland and farther south, were secured at St. 

 George's, August 28-31, on the surface of brackish water. A 

 single specimen was found at Woburn, August 30, on a sluggish 

 stream in the open flat country near sea-level. On the Telescope 

 estate a pair were taken while in sexual connection, August 12, 

 on a brackish pool next the sea-shore. The male of this pair is 

 winged and the female unwinged. In the eastern United States 

 this species frequents the bayed out parts of streams and the mill- 

 ponds, and is distributed inland to near the head-waters of creeks 

 which rise in the western portion of the Piedmont country, as in 

 Trederick county, Maryland, and Spottsylvania, Virginia. 



As the name of this genus is preoccupied, and the genus has 

 not yet been fully described, for lack of winged specimens, it 

 becomes necessary to give the following characters, which are in aug- 

 mentation of those given by Dr. Buchanan- White : — Anterior tarsi 

 normally three-jointed (exceptionally two-jointed) ; the hemelytra 

 curved and tapering at base, gradually becoming wider towards 

 the tip, at which point it is a little triangular and rounded ; the 

 corium subtriangular and about one half as long as the membrane, 

 with three stout longitudinal veins, of which the costal is more 



Peoc. Zool. Soc— 1894, No. XV. 15 



