ONE NEW GENUS AND EIGHT NEW SPECIES OF DIP- 

 TEROUS INSECTS IN THE UNITED STATES NATIONAL 

 MUSEUM COLLECTION. 



By J. R. Malloch, 



Of the Bureau of Entomology , United States Department of Agriculture. 



In this paper there are presented descriptions of four species of 

 Simuliidse from Peru which were sent in for identification by Mr. 

 C. H. T. Townsend, chief of the entomological station, Lima, Peru. 

 The species of this genus are at present the subject of study by the 

 writer of this paper in connection with the pellagra investigation. 

 Owing to the theory which has been put forward that they are the 

 possible transmitters of this disease, and as these four species are 

 undescribed it is considered advisable to give descriptions now rather 

 than await the publication of the paper dealing with the North 

 American species which is in course of preparation. The Pipunculidae 

 are parasitic on leaf hoppers (Hemiptera-Homoptera) and are of con- 

 siderable economic importance. 



SIMULIUM BICOLORATUM, new species, 



Plate 46, figs. 6, 7. 



Female. — Frons black, shining, v\dth slight whitish dusting, raised 

 in center, slightly tuberculate at lower angles, sides very slightly 

 divergent toward vertex, -width at upper angle of eyes about one- 

 fourth the breadth of head; face (see fig. 6) distinctly white dusted, 

 especial!}^ on upper portion, the dusting below the bifid raised por- 

 tions yellowish, very few hairs on either face or frons, antennae 

 broken, but the two basal joints still left are black; palpi black, 

 postocular cilia pale, with an admixture of much longer black hairs. 

 Prescutum bright 3'ellow, scutum concolorous, opaque, with opaque 

 deep black marldng as in figure 7, pilosity sparse and hairlike, yellow, 

 some upright black hairs on posterior margin,' middle part of extreme 

 lateral margin deep black, pleurae brownish, yeIlo^vish posteriorly, on 

 center \vith silky white polHnosity, pleural hair tuft brown; scutellum 

 clear yellow, with numerous upright black hairs which are most con- 



Proceedings U. S. National Museum, Vol. 43— No. 1945. 



649 



