344 HEMIPTERA-HETEROPTERA. 
CRYPTOCERATA. 
This second main division of the Rhynchota-Heteroptera includes all those forms in 
which the antenne are very short and inserted on the underside of the head, often 
concealed in grooves or fovee. With the exception of the species of the first two 
families, which live on the banks of streams, &c., they are all aquatic. The whole 
of the preceding families dealt with in this volume, and in Vol. I., belong to the 
Gymnocerata, Fieb. (=Geocorise, Latr.), the remainder to the Cryptocerata, Fieb. 
(= Hydrocorise, Latr.). 
Fam. PELOGONIDA. 
Galgulide, subfam. Pelogonina, Stal. 
PELOGONUS. 
Ochterus, Latreille, Gen. Crust. et Ins. iii. p. 142 (1807). 
Pelogonus, Latreille, op. cit. iv. p. 384 (1809); Burmeister, Handb. der Ent. ii. 1, p. 202 (1835) ; 
Fieber, Gen. Hydroc. p. 14, t. 1c (1851); Herrich-Schaffer, Wanz. Ins. ix. p. 23, t. 290. 
figg. A-F; Stal, knum. Hemipt. v. p. 137. 
A widely distributed genus, of which four species* have been described from 
America, one of them being from within our limits, whence three others are now added. 
They have very much the general facies of Salda. The Central-American forms differ 
from the Palearctic P. marginatus, Latr., as well as from the North-American 
P. americanus, Uhler, in having the pronotum much narrowed in front. The flavescent 
markings at the sides of the pronotum show the extent of the expanded semitransparent 
margins. ‘The tarsi are 2-, 2-, 3-jointed, the basal joint of each being very short. The 
males have the seventh ventral segment split down the middle, leaving the terminal 
genital segment exposed, and they are very apt to be mistaken for the opposite sex f. 
Dr. Bergroth (Bull. Soc. Ent. Fr. 1890, pp. xvi, cxix) has revived Latreille’s first name for 
this genus, though the author himself changed it, presumably to avoid confusion with his 
earlier Ochthera (Diptera, 1802 {). These insects live upon the sandy banks of streams, 
a. Anterior angles of the pronotum acute, the lateral angles rounded ; 
face not or obsoletely carinate between the eyes ; elytra with a row of 
four or five well-defined ochreous spots along the outer margin . . . perbosci, Guér. 
6. Anterior angles of the pronotum obtuse or rounded ; elytra, at most, with 
very small ochreous spots along the outer margin. 
a’. Face not carinate between the eyes; lateral angles of the pronotum 
rounded. 2. 2. 2. 1 ee ee eee ee ee ww. @neifrons, D. sp. 
* P. perbosct, Guér., from Mexico, P. americanus, Uhler, from North America, and P. vietor, Boliv., and 
P. splendidulus, Mont., from Ecuador. 
+ Fieber’s figure of the male abdomen appears to have been taken from a female, and the same remark 
applies to Mononyx. + Hist. Nat. Crust. et Ins. xiv. p. 391. 
