THE CANADIAN ENTOMOLOGIST 61 



end a single undivided plate. Also no mention is made of the fact that in 

 Physokermes the opercula are wanting in the adult female, in fact (p. 175) it is 

 said that the adult female has the "opercula prominent, swollen, dorsal in 

 position." The structures referred to are not the opercula, which are lacking 

 in this stage. 



Concerning the Asterolecaniinae I shall note only that to it is referred the 

 genus Olliffiella. I reaffirm the opinion which I have formerly expressed, that 

 this species is closely related to Kermes and should accompany the latter where- 

 ever it may be placed. 



The subfamily Kermesinse is based upon the single genus Kermes. As 

 I have previously indicated I regard this genus as strictly Eriococcine, and see 

 no reason for the subfamily Kermesinae. I may note that MacGillivray's 

 statement (p. 191) that the anal ring is wanting in the adult female is erroneous. 

 In K. cockerelli, kingii, nigropu7ictatus and vermilio, at least, the anal ring is 

 well developed in the adult female, although it bears no setae. 



(To be continued.) 



A SYNOPSIS OF THE NORTH AMERICAN SPECIES OF THE GENERA 

 MELANOCHELIA RONDANI AND LIMNOPHORA R.-D. 



(DIPTERA, ANTHOMYIID^.) 



BY J. R. MALLOCH, 

 Urbana, 111. 



This group is the Limnophora of authors, the name Limnophora being 

 applicable to the species which have the prosternum and base of third vein 

 setulose; the other segregate requires a change of name and apparently Rondani's 

 name must be. used. 



The species of Melanoclielia occur most commonly in the north and usually 

 along the margins of lakes or streams. Limnophora occurs more commonly 

 in the south, many species being found in the tropics throughout the world, 

 and even very frequently on small islands far removed from the large land 

 masses. The larvae are, so far as I know, aquatic. 



Melanochelia Rondani. 

 Key to Species. 



1. Thorax with four pairs of postsutural dorsocentral bristles; halteres yel- 



low (cf. obsoleta) 2. 



— Thorax with four pairs of postsutural dorsocentral bristles; halteres black 



or brown 13. 



— Thorax with three pairs of postsutural dorsocentral bristles 19. 



2. Orbital hairs descending much below level of base of antennae; facial 



ridges haired about midway to base of antennae; basal abdominal 

 sternite haired Lispoides aequalis (Stein). 



— Orbital hairs not descending below base of antennae 3. 



3. Basal abdominal sternite with some setulose hairs; fourth wingvein usually 



slightly curved forward at apex Eulimnophora Malloch, 



— Basal abdominal sternite bare 4. 



4. Eyes of male separated by much less than distance across posterior ocelli; 



sternopleurals 1:1; anterior acrostichals in two series; hind tibia with 

 one anterodorsal and one anteroventral bristle torrevcc Johannsen. 



March, 1921 



