82 GEO. H. HORN, M. D. 



In recent years this insect has attracted much attention in our 

 country from the damage done to the Elm trees, which are sometimes 

 almost entirely defoliated. For an account of these ravages the 

 reader will consult " Insect Life" and the reports of several experi- 

 ment stations. 



M. L. de Joannis, in Abeille iii, p. 84, adopts the name cratwgi 

 Forst. for this species, but I have not been able to satisfy myself 

 that the description applies to the species under consideration. 

 Forster, moreover, gives Cratoigus oxyacantha as the food-plant of 

 his species. 



Occurs abundantly all over Europe, and in our country from 

 Massachusetts southward. 



lVIOi\OXIA Lee. 



Head oval, moderately convex, not deeply inserted, front feebly 

 or not impressed. Antennae filiform, not longer than half the body, 

 third joint as long as the first, fourth longer than the second, joints 

 6-10 subequal in length ; labrum moderately prominent, truncate 

 with rounded angles ; maxillary palpi moderately stout, second and 

 third joints obconical, the terminal conical and more slender ; pro- 

 thorax transverse, widest at base, except in sordida; scutellum oval 

 at tip; elytra oblong, scarcely broader behind the humeri, closely 

 and irregularly punctured, the side margin not prominent ; epipleurae 

 narrow, but extending nearly to the tips of the elytra ; prosternuui 

 entirely obliterated between the coxse, the coxal cavities open behind. 

 Legs moderate, the anterior tibiae indistinctly grooved on the outer 

 side, tibise without terminal spurs ; tarsi shorter than the tibise, the 

 first joint as long as the next two ; claws dissimilar in the sexes, 

 finely bifid in the male, absolutely simple in the female. 



The definitive characters of the genus are — the anterior coxal 

 cavities are open behind, the prosternum obliterated between them ; 

 the tarsal claws not appendiculate, but finely bifid in the male and 

 simple in the female. In the group Atysites, to which it is referred 

 by Cl)apuis, it may be known by the short antennae, of which the 

 third joint is longer than the fourth. 



To Mr. Crotch we owe the observation that the differences in the 

 claws are sexual and not specific, as Dr. LeConte was disposed to 

 consider them. Chapuis seems not to have known the observation 

 of Crotch, and expresses the view that the strictest account should be 

 taken of the claws, and that the two sections indicated by LeConte, 

 which we now know to be sexes, should l)e made distinct genera. 



