NORTH AMERICAN HOMOPTERA. 257 



(Id. Protlionix convex in front, unarmed, posterior process convex at 



least as far as middle Stictocopliala Stal. 



na. Passing out of base of coriura three longitudinal veins, one radial, two 

 ulnar, all or two contiguous toward base of tegmina; prothorax 

 convex, posterior process sensibly acuminate; apical cells of 

 wings not stylated, base truncate, 

 e. Corium with five apical cells; lateral margins of prothoracic poste- 

 rior process distinctly impressed lengthwise Pliaeiiisa Stal. 



•••'. Corium with two discoidal cells Subg. Euritea Stal. 



•■■•". Corium with one discoidal cell Subg. Phacusa Stal. 



ee. Corium with four apical cells, one discoidal; lateral margins of 

 l)osterior prothoracic process not or obsoletely impressed. 



Aciitalis Fairm. 

 'J'ribe Polxjglyptbu Godg. 



.4.1. Clavus, and frequently part of corium, covered by prothorax. 



a. Passing out from base of corium two veins, radial and ulnar, contiguous at 

 or near base of tegmina; apical cells of wings stylated. 

 b. Anterior part of prothorax destitute of a porrect process. 



c. Back of prothorax acute, strongly elevated, compressed, deeply notched. 



Kiitylia Burm. 

 cc. Back of prothorax convex, before or at middle little depressed. 



Piiblilia Stal. 

 hh. Anterior iiart of ])rothorax armed with a long, porrect process. 



Polyglypta Burm. 



Tribe Smlliini Godg. 



ita. Passing out from base of corium three veins, contiguous near base. 



d. Wings with three, and frequently four, apical cells, the second in 

 that^-a.se stylated. 

 e. Corium with one or two discoidal cells. 

 /. Corium destitute of a transverse venule between tlu' two interior 

 longitudinal veins, before the middle; one discoidal cell 

 before the second apical cell ; back of prothorax strongly 

 elevated, compressed, acute, highest anteriorly. 



5<iinilia Germ. 

 ff. Corium with a transverse venule between the two interior longi- 

 tudinal veins; two discoidal cells, one before the two inte- 

 rior apical cells and behind the transverse venule, the other 

 before the second apical cell. 

 g. Prothorax with back compresso-acute. 



h. Prothorax with a large elevation, before the middle highest, 

 |)osteriorly acuminate, lateial angles produced in a trian- 

 gular lobe, which extends obliquely outward ; tegniina 

 scarcely reaching ajiex of posterior prothoracic inoccss. 



Jaiitlio stal. 

 hh. Prothorax lightly compresso-elevated, lateral angles obtuse, 

 not prominent ; front angles not produced. 



Cyrtolobiisf Godg. 



t = Cyrtosia Fitch, which is preoccupied in the Diptera. 



TRANS. AM. £NT. SOC. XIX. (33) NOVE.MBER, 1892. 



