892 FAMILY XXIX. — MIRID;£. 



afterward (1909, 58) merged with Camptobrochis. It was re- 

 tained by Van Duzee as a subgenus of Canptobrochis. 



V. DER^EOCORIS Kirschbaum, 1855, 191, 208. 



Oval or oblong-oval, rather robust, usually subglabrous 

 species, having the head short, broader than long, subporrect, 

 wider across eyes than apex of pronotum, vertex margined be- 

 hind ; eyes large, widely separated ; beak reaching upon or 

 slightly passing middle coxae, rarely (grandis) reaching second 

 ventral ; antennae inserted slightly above the lower margin of 

 eyes, almost half the length of body, the joints variable in 

 length as to species ; pronotum trapezoidal, collar narrow but 

 distinct, disk rather coarsely punctate, wider at base than 

 long, sides usually straight, calli oval, smooth, shining; scu- 

 tellum triangular, nearly equilateral ; elytra entire, surpassing 

 tip of abdomen, usually more elongate in males, cuneus rather 

 strongly deflexed, fracture deep ; legs rather long, hind femora 

 moderately swollen, tibiae beset with prominent hairs, the 

 middle and hind ones usually also with one or two rows of 

 spines. The genus is a very large one and has a world-wide 

 distribution. Knight in his monograph (1921) stated that in 

 the genus Deraocoris, as recognized by him, there now belong 

 146 species and 62 varieties. Of these (exclusive of the genus 

 Camptobrochis, as above separated), 44 species and 20 varieties 

 occur in North America, 31 species and 18 varieties having been 

 described by him as new in the paper cited. Of them he says: 



"I have been able to associate with definite host plants all but two 

 of the known eastern species as well as certain of those found in the 

 southwestern states. In several instances this relation appears to be 

 more dependent on the predaceous habits of the bugs which feed largely 

 on the aphids or plant lice found on particular hosts, rather than the 

 sap from the plant. In fact I have not detected a single case where the 

 bugs have fed on the foliage of a plant and produced the characteristic 

 leaf -bug injury which is always to be seen on plants infested by true 

 leaf-feeders. The general scarcity of these insects as compared with 

 leaf-feeding species is only another indication of their predatory habits, 

 for predaceous forms never attain great abundance except sporadically 

 in favored spots." 



Our eastern species of Deraocoris, as here limited, are sep- 

 arated into four groups as follows : 



KEY TO GROUPS OF EASTERN SPECIES OF OER.EOCORIS. 



a. Scutellum punctate; tarsal claws deeply cleft near base (pi. X, fig. 

 30). Group A, p. 893. 



