HR>riP'J'l'',nA HRTRROPTEnA. 165 



+1 Head not deflexed. Male. — Anal segment of 

 moderate size. Feiiuilc — Sixth ventral seg- 

 ment truncated, nut eionj^ated. 

 § Outer border of tlie coriuni much longer than the 

 suture of the clavus. 

 X Third and fourth joints of the antenna' not nearly 



of equal length. - - - . Roscius. 



X X Third and fourth joints of the antenna) equally 



long or nearly so. - - - . Melamphaus. 



§§ Outer border of the corium and suture of the 



clavus nearly equally long. 

 X Third and fourili joints of the rostrum as long as 



the second or a little longer. - - Odontopi's. 



XX Third and fourth joints of the rostrum much 

 longer than the second. 

 o Head not received into the prothorax as far as the 



eyes. . . - - . Dinoymus. 



oo Head received into the prothorax as far as the 



eyes. . - . - - Dysdkrcus. 



** Fore wings sometimes abbreviated and without 

 a membrane; apical border of the coriuni 

 rounded, 

 f First joint of the rostrum longer than tlie head. - Pyruhocoris. 

 jf First joint of the rostrum shorter than the head. - Scanxius. 



bb. Fore wings abbreviated, truncated. - ■• Dekmatirnes. 



The above author uses the following method in Kongliga Svensku 

 Velenskaps-Akademiens Haiidlingar, 1870: — 



LARGINA. 



A, Head with no longitudinal furrow beneath. 



a. Hind part of the head between the eyes trans- 

 versely concave or nearly flat. 



* Fore coxEE armed with a spine. - - - Fibrenus. 

 ** Fore coxae unarmed. 



■\ Eyes much petiolated. - - - - Astemma. 



ff Eyes slightly petiolated or sessile. 



\ Bt>dy oblong or narrowly oval. - - - Lakc;us. 



\\ Body narrow, linear. 



§ Head excavated between the shoit-peliolated eye. Tiiei!aneis. 



§§ Head flat between the sessile eyes. - - Stenomacra. 



I). Head convex above and beneath. - - Aiuiaphe. 



B. Head with a longitudinal furrow beneath. 



a. First joint of the antenna; longer than the head 



and the thorax together. - - - MArKoriiERAiA. 



b. First joint of the antenna; not longer than the 



head and the thorax together. 



* Fore area of the jjrolhorax remote from the fore 



border. - - - - - Tpiiita. 



** Fore area of the prothorax extending to the fore 



border. - . . . , Piiysoi'ia.rA. 



