XXxii, '21] ENTOMOLOGICAL NEWS 



with the following segments than in these specimens. In this 

 respect and in sensoriation it fits nudus (De Geer) of both 

 Del Guercio and Cholodkovsky. except thai IV ceriainly is not 

 "much" longer than VI. Furthermore the rostrum does not 

 reach to the end of the abdomen, in reality scarcely to t he- 

 middle. The cornicles are considerably smaller than those fig- 

 ured by Del Guercio for nudus De Geer. For these reasons tin- 

 writer considers that Lachnus pini (Linn.) of Walker and 

 Buckton is Dilachnus tacniatns (Mordw.), and so places it as 

 a synonym. 



The Genus Diamesa Meigen (Diptera, Chironomidae). 



By O. A. JOHANNSEN, Cornell University, Ithaca, New York. 

 Among the Chironomidae, taken in a tent trap which was sei 

 over a riffle near Fall Creek, Ithaca, N. Y.. were specimens of 

 a species of Diamesa with yellow thorax. As this form appears 

 lo be new, it is described herewith. There are several Euro- 

 pean species which resemble it. I), yaedii Meigen approaching 

 it most closely. This European species differs, however, in 

 having a brownish border at the anterior end of the median, and 

 at the posterior end of the lateral thoracic stripes ; a median 

 yellow stripe on the metanotum, and a relatively lunger fore 

 basitarsus. 



Diamesa fulva n. sp. 



9 . Length 2.2 mm. Head yellow, a diffuse brownish spot on each 

 side of the median suture on the vertex; front broad, over half the 

 width of the head, including eyes, in frontal view. Eyes black, some- 

 what emarginate, glabrous, facets large. Antennae with eight visible 

 segments, yellow ha sally, apieal segment fuscous, with dusky hairs ; 

 the basal segment large, disc-like, the second, third and fourth seg- 

 ments slightly longer than broad, second and third not sharply s 

 rated from each other, fifth, sixth and seventh about twice as lon as 

 broad, eighth fusiform, not quite as long as the preceding three taken 

 together, total length of antenna 0.25 mm. Kpistome subtriangular. sub- 

 fuscous, dorsal surface with rather long bristly hairs, tran>\ cr.se suture 

 very distinct; palpi four-segmented, lirst and second segments suhemKil. 

 third slightly longer, fourtli about twice as long as the second; total 

 length of palpus about 0.5 mm. 



Thorax yellow, whitish pruinosc. subshining, dorsum with tlmv 

 broad, more or less distinct ferruginous vittae, laterals anterior!), mid 



