68 ENTOMOLOGICAL SOCIETY 



in a certain sense it is also an officinal species. Since Linnaeus 

 clearly stated the principles that govern the division of his 



fenera, he should be taken at his word and the type should be 

 xed accordingly. To take Linnaeus at his word results in 

 selecting lectularius as the type of Cimex. 



To the objection against this ruling raised by some authors, 

 namely, that Linnaeus defined Cimex as possessing four wings 

 while lectularius was given without wings, it may be replied 

 that in naming a genus we name the object, not our concep 

 tion of the object. Hence the generic diagnosis given by Lin 

 naeus should not be held to be of greater importance than the 

 distinct statement by Linnaeus that in case of a division of his 

 genera, the old generic name should follow the most common 

 species. 



Mr. Phillips exhibited a puparium resembling that of the 

 Hessian fly (Mayetiola destructor Say) taken the summer 

 before on a native grass (Agropyron), at Richmond, Ind. 

 He was unable to say whether or not it really was that of the 

 Hessian fly. Larvae of the latter are thought to survive only 

 on wheat, barley, and rye, and the " flaxseeds " sometimes 

 found on various native grasses have been supposedly the 

 pupae of some other species more or less closely related to the 

 Hessian fly. 



Mr. Heidemann exhibited three new species of the hemip- 

 terous genus Aradus and presented the following paper: 



THREE NEW SPECIES OF NORTH AMERICAN ARADID^. 

 By O. HEIDEMANN. 



Aradus shermani, n. sp. 



Body narrow, very elongate ovate, uniformly deep black, and finely 

 granulate. Head much longer than broad; apical process straight, ex 

 tending beyond base of second antennal joint, rounded at tip, compressed 

 on the sides ; antenniferous processes sharply pointed, slightly diverging, 

 and not quite reaching to tip of basal joint of antennae; on the disk of 

 head between the eyes is a U-shaped deep impression; the postocular 

 part of head tumidly rounded. Antennae smooth, as long as head and 

 pronotum together; basal joint very short, cylindrical; the second a 

 trifle longer than twice the length of the third, both gradually thick 

 ening towards the apex; apical joint somewhat shorter than the 

 penultimate, fusiform, pale at tip. Rostrum slender, reaching to the 



