310 



THE CANADIAN ENTOMOLOGIST 



narrow. Head of characteristic shape, the lateral margins con- 

 tinuous with the eye and slightly swollen above the base of the 

 antcnnic, the temples prominent. Oesophageal sclerite and glands 

 apparently lacking. Anterior femora much flattened and expanded. 

 Second abdominal stcrnite ne\er with asters of spines. Cienitalia 

 of the male of the same type as in Myrsidce. 



Occurring, as far as known, only on Micropodida' (Order 

 Coracii formes). 



Type of the genus Nitzschia burmeisteri Ueimy. 



The genus is in many respects very similar to some of the 

 species of Myrsidea {M. dissimile, for instance), but the combina- 

 tion of characters ^iven is sufficient to distinguish the two. There 

 are less than a dozen species known, and some of these are aj)- 

 parently synonyms. Dennyus duhiiis (Kel.), which was described 

 from immature specimens, is \ery likely a synonym of either 

 D. burmeisteri or D. tibialis, but. in the absence of specimens of 

 these two species, little can be done to 

 settle the matter. D. bruneri (Car.) is 

 almost certainly a synonym of D. dnbius, 

 as a cotype of the former which I have 

 before me shows, and some of Carriker's 

 other species appear doubtful. Nitzschia 

 latifrons Carriker is almost certainly a 

 Myrsidea. 



Dennyus distinctus, n. sp. 



Description of female — Length 2.2 mm., 

 colour a uniform dark brown. 



Head as long as wide, triangular in 

 shape, except for the rather broadly 

 truncate anterior margin, which distin- 

 guishes the species from all the others in 

 the genus. Occipital bands distinct, ex- 

 tending forward to abo\c the bases of 

 the mandibles. Principal points of the 

 clKctotaxy as follows: A pair of slender 

 hairs directly above the base of each 

 mandible; a longer hair on the lateral '"'"'• 'VemrarsTdel^fma^e:- "• '''•' 



