4 . HEMTIPTERA-HETEROPTERA. 
Stal, upon the following principal characters :—‘“ Les lobes latéraux de la téte réunis au 
‘dela du médian et-formant deux lobules arrondis réfléchis, les bords d’abord convexes 
prés des yeux, puis concaves, sinués 4 l’extrémité; les antennes avec le second article 
trés-court. Canal ostéolaire terminé par un lobe irrégulier présentant une dent en 
dessous.” | 
1. Syllobus emarginatus. (Tab. III. fig. 6.) 
Cyrtomenus emarginatus, Stal, Stett. ent. Zeit. xxiii. p. 95 (1862) !. 
Syllobus emarginatus, Sign. Bull. Soc. Ent. Fr. (in litt.). 
Hab. Mexico}. 
This seems to be a somewhat rare form, especially out of Mexico. I have not hitherto 
seen it in collections from Guatemala, Honduras, Nicaragua, Costa Rica, or Panama. 
The specimen figured is in the possession of Dr. Signoret. | 
AETHUS. | 
ithus, p., Dallas, List Hem. i. pp. 110 et 112 (1851) ; Stal, Hem. Afr. i. pp. 19 et 20 ; Uhler, 
Bull. U.S. Geol. & Geog. Surv. iii. p. 378. 
This genus as at present restricted is mostly represented in the Ethiopian and Oriental 
Regions. Prof. Uhler records one species from the Nearctic Region. JI retain the fol- 
lowing species in the genus, as agreeing with Stal’s diagnosis, though that author enu- 
merated no American representatives. ‘“Corporis marginibus pilis vel setis sat numerosis 
ciliatis; capite intra marginem anticum spinulis vel setis brevibus rigidis sepissime 
instructo.” The scutellum is also triangular and narrowed at tip. 
1. Aithus nitidulus. (Tab. III. fig. 3.) 
Aithus nitidulus, Walk. Cat. Het. i. p. 154). 
Hab. British Honpuras, Belize’. 
The figure is from the type and only specimen in the British Museum. 
. RHYTIDOPORUS. 
Rhytidoporus, Uhler, Bull. U.S. Geol. & Geog. Surv. iii. p. 380 (1877). 
This genus is allied to those with the scutellum triangular and narrow atthe tip; the 
head is furnished with a very obscure submarginal row of small erect teeth and fine 
bristles; the ostiolar canal is short, narrow, and subfusiform. It contains but one 
species. 
1. Rhytidoporus indentatus. (Tab. IV. fig. 9.) 
Rhytidoporus indentatus, Uhler, Bull. U.S. Geol. & Geog. Surv, iii. p. 3801. 
Hab. Sovrnern Fioripa 4.—Mexico (Mus. Berol.).—Cusa !. 
