152 ENTOMOLOGICAL NEWS. [May, 



spots on the upper surface. The spots become more conspicuous 

 as the insects mature, and the leaves fall prematurely. The spe- 

 cies is related to Aspidiotus iivce, but is easily distinguished from 

 that insect by its yellowish gray or whitish scale and concolorous 

 exuviae. The half mature females hybernate under the leaf buds. 

 I have not found this insect on any other tree than maple, and as 

 it attacks the leaves, principally, I have proposed the above 

 popular name. Its specific name is proposed in honor of Prof. 

 J. H. Comstock, of Cornell University, who first instructed me 

 in this most interesting group of insects. 



The Elm Aspidiotus (^Aspidiotus ulmi). — This species has been 

 found on the trunk of white elm ( Ulmus americana) on the Uni- 

 versity campus, in rather limited numbers. So far as my obser- 

 vations go it does not attack the branches, twigs or leaves. This 

 scale is not so important, economically, as the preceding species. 



The Bucl(eye Aspidiotus {Aspidiotus csscuH). — I found this 

 species very abundant on buckeye {Aesculus californicd) in Santa 

 Clara County, California, two years ago. It attacks the trunk, 

 branches and smaller twigs, but so far as I have observed the 

 scale, I have never seen it on the leaves. It is' a very prolific 

 creature, and often colonates to such an extent as to completely 

 cover the branches. The color of the scale conforms to that of 

 the bark, and where not abundant is difficult to detect. 



TWO DOLICHOPODID GENERA NEW TO AMERICA. 



By William Morton Wheeler, Ph.D. 



(University of Chicago.) 



While looking through a lot of Dolichopodidae collected during 

 the Summer of 1895, I happened on two species which represent 

 genera that have long been known to occur in Europe, but whose 

 presence in America has not been noted. 



Of the first genus, Xipha7idriu77i, Loew (Monog. ii, p. 142) 

 believed that he had seen a single female specimen from North 

 America, but it had lost its antennae, so that he could not be cer- 

 tain of its systematic position. My specimens agree in most 

 respects with the generic characters given by Loew, although the 

 sudden constriction of the long third antennal joint near its base 

 and the long beard of cilia on the inferior orbit might lead one 



