HEMIPTERA CORISIDEA COEISA DISPERSA. 841 



NEPIDAE. 



RANATRA, Fab. 



BAN ATE A QUADEIDENTATA, Still. 

 Ranatra quadridentata, STAL., Ofversigt Kong. Vet. Akad. Forliandl., 1861, 204. 



One specimen from Owen's Valley, California, by F. Bischoff. It cor- 

 responds exactly with specimens from Western Mexico. 



NOTONECTIDAE. 



NOTONECTA, Linn. 

 NOTONECTA INSULATA, Kirby. 

 Notonecta insulata, KIKBY, Fn. B.-Am., 285, No. 399. 

 Owen's Valley, California (F. Bischoff). 



This species seems to extend entirely across the continent, north of the 

 fortieth parallel, and on the Pacific side extends as far south as San Francisco 



CORISIDAE. 



CORISA, Geoff. 



1. COEISA DISPEESA, sp. nov. 



PLATE XL1I, FIG. 7. 



Pale dull testaceous, robust, lineated with dark brown. Head broad, 

 the cheeks remotely, obsoletely punctured, an impressed line at the inner 

 margin of the eyes coarsely punctured, and each side of the middle line 

 of face with a series of coarse shallow punctures ; occiput angularly pro- 

 duced, carinated, broadly impressed on each side. Eyes subtriangular, the 

 inner angle rectangular. Pronotum broad, short, pale, having eight, or 

 rarely nine, brown transverse" lines, of which the three central ones are 

 abbreviated and more slender; the surface minutely rastrated; the anterior 

 margin emarginated, and with a very short carina just behind this ; the 

 posterior margin broadly rounded. Legs pale testaceous ; the tip of the 

 basal joint of the intermediate tarsi brown; palse of the female falcate, acute 

 at tip, almost as long as the femora ; in the male, the anterior tibiae are 

 flattened, curved inward, and the palse are very short, broad, placed 

 obliquely, and of the form of an arrow head with the basal angles rounded. 

 Hemelytra with slender transverse, undulated, interrupted, and tolerably 



