48 THE UNIVERSITY SCIENCE BULLETIN. 



Genus MONONYX Lap. 



In these bugs the body is more quadrangular than in Gelastocoris. 

 The thorax being fully as broad as the abdomen. The adults have one 

 strong claw on fore tarsus instead of two as in GelastocoHs. The an- 

 tennae are 4 segmented, the third segment being narrow, "barely one-third 

 the length of the fourth and almost connate with it." Champion. 



Mononyx fuscipes Guer. 1843. 



Guerin Rev. Zool. for 1843. 



This neotropical insect has been recorded for California. This species 

 of Mononyx has the fore femur widest toward the base. The last segment 

 in the male is small and placed considerably to the left of the longitudinal 

 axis of the body, and the preceding ventral segment is foveate on the 

 right side near the margin. In the female the two triangular pieces 

 forming the last segment are broader than long, and the sixth is not very 

 deeply emarginate. 



Genus NERTHRA Say. 



Shape suboval, depressed; head short and broad; scutellum small; 

 hemelytra entirely coriaceous and linearly roughened in prominent points, 

 soldered together along a straight suture indicated by a groove. Rostrum 

 small. Anterior femora basally incrassate; tarsal claws single. Abdo- 

 men rounded. Male genital segments laterally deflected. 



Nerthra stygica Say 1832. 



Say Heter N. Harm, p. 37. 

 Bueno, Ohio Nat. Vol. V, p. 287. 



"Moderate in size, suboval, depressed; head short and broad with four 

 tubercles in the middle, the outer two less elevated than the middle two; 

 triangular in front and reflexed. Eyes reniform, not very prominent. 

 Ocelli absent. Rostrum short, small and so hidden under the head as to 

 be hardly visible (joints not counted for this reason). Prothorax, sides 

 subparallel, curvedly converging in the cephalic third; base slightly 

 sinuate; laterally flattened; apex nearly straight except at the eyes; disk 

 much elevated and roughened. Scutellum triangular, sides sinuated, 

 much roughened. Hemelytra slightly flattened and dilated at the humeral 

 angles and gently curvedly, sloping to the rounded extremity; entirely 

 coriaceous and linearly roughened in acute elevations along the lines of 

 the sutures; soldered into one piece along a straight sulcate suture ex- 

 tending from the caudal angle of the scutellum to the tip of the hemely- 

 tra; apparently soldered to the scutellum as well; not entirely covering 

 the abdomen, the connexival segments being moderately visible beyond 

 the costal margin ; extending beyond the end of the abdomen. First pair 

 of legs raptorial. Anterior femorje incrassate, flattened anteriorly and 

 coming to a point; coarsely granulate; tarsal claws single. Intermediate 

 and posterior pedes cursorial; femorse normal with a row of blunt teeth; 

 tibiae with two rows of stout spines with a sulcus between; tarsi one- 

 jointed in intermediate pedes and provided with double claws (tarsi of 

 posteriors lost in the specimen before me). Mesosternal tubercle rather 

 acute and laterally somewhat flattened, terminated by bristles. Male 

 abdominal segments much compressed in the middle to give room for the 

 large and prominent genital segments which are deflected toward the 

 right. Abdomen rounded, with an entire margin. 



"Color, blackish-brown above, except the flattened prothoracic and 

 hemelytral lobes which are yellowish and translucent. Underside of the 



