Mr. G. W. Kirkaldy on Aquatic Rhynchota. 53 
rate it from Sigara, Fabr., and the comparatively short 
posterior pedes from the long-legged Nychia, Stal. It 
appears to be most closely related to Corixa, and perhaps is 
intermediate between that genus and Nychia. 
1. Diaprepocoris barycephala, sp. n. 
Caput subquadratum, basi concava, cum oculis hemispheroideum, 
oculorum marginibus Jateralibus interioribus fere parallelis, fere 
perpendicularibus capitis ad basin, verticem versus leviter diver- 
gentibus, basi quam oculorum utrorumvis basi latiore (a super. 
vis.). Pronotum circiter quadruplum latius quam longius, rugu- 
losum. Scutellum isoscele, non acuminatum. Hemielytra 
pubescente curtissima instructa, membrane lobis subequalibus. 
Tarsi intermedii unguiculis longiores, tarsi tibiaque subequales. 
Femora anteriora apicem versus calcare subtruncato instructa. 
6 mihi ignotus. 
Q. Palarum segmentum 1"™ (a latere vis.) angustum, sublunatum ; 
subtus concavum ; segmentum 2" angustissimum, convexiuscu- 
lum, subcylindricum. Capitis frons longitudinaliter mediatim 
subcarinata. 
Head flavous, wider basally (seen from above) than either 
of the eyes, dorsal surface roughly square, interior lateral 
margins of the eyes nearly parallel and almost perpendicular 
to the base of the head, slightly diverging from the base; 
base of head concave, slightly sinuate. Head with eyes (seen 
from above) hemispheroidal; eyes fuscous. Pronotum about 
four times as wide as long, very finely rugose, brownish black 
anteriorly (pale where covered by the head), flavescent poste- 
riorly, lateral margins widely luteous. 
Scutellum flavescent, infuscated, isosceles triangular, very 
large, lateral margins narrowly black. 
Hemielytra sordid yellowish (slightly infuscated near the 
base of the clavus, on the basal half of the corium, and more 
or less of the apical half of the membrane), without guttulate 
or vermiculate markings ; scutellum and hemielytra furnished 
with short black pubescence. Lobes of membrane subequal. 
Anterior half of embolcum luteous. 
Metanotum black ; dorsal surface of abdomen dark fuscous 
(varying) ; connexivum dark fuscous anteriorly, paler poste- 
riorly. Pedes, including unguiculz, luteo-testaceous ; anterior 
Jemora armed with a blunt spur near the apex; intermediate 
tibie and tarsi subequal, unguiculi shorter; intermediate 
femora with short golden hairs; posterior tibie and tarsi 
armed with short concolorous spines. 
Whole ventral surface flavescent testaceous, with very fine 
short pale yellow pubescence. 
