387 



cate a continuous occurrence throughout the warmer portions of the 

 year. The species is abundant in Europe, including the British Isles. 



A large number of specimens of both sexes of this species were 

 reared from larvae found in Salt Fork at Homer Park, 111., March 

 21, 1914. The larvae made slight cases amongst the debris in the bot- 

 tom of the vials in which I placed them, but generally transformed to 

 pupse outside of them. Their peculiar jerky movements during the 

 pupal stage when swimming distinguish them readily from other 

 Ckirononiidcc, which is also true of the Tanypincc in general, but this 

 characteristic is of no use in classifying alcoholic material. Although 

 the only food available for the larvae that I tried to rear was dead 

 vegetable matter, nearly all became adults, the few that died being 

 killed by a water mold or similar agency. The pupal stage lasted about 

 three days. 



Larvae were obtained from the Illinois River or connected waters 

 as follows : Horshor Slough, Peoria Lake ; Averyville, river channel ; 

 Havana, along shore on both sides of river and Matanzas Lake ; 

 Stewart's Lake; Meredosia; and mouth of McGhee Creek. A few 

 larvae were also obtained from Spoon River. 



4. Protenthes choreus Meigen 



Tanypus choreus Meigen, Klass. u Beschr. d. Europ. Zweifl. Ins., 1804, 1: 23, 6. 



Male. — Coloration identical with that of culiciforuiis, except that 

 the wings show a very faint suffusion on the apical half, and the 

 cross vein, with the region immediately adjoining it, is suffused with 

 fuscous. 



The principal distinctions between this species and ciiliciformis 

 may be summarized as follows : hypopygium differing in the shape of 

 the apical portion of lateral arm (PI. XXVIII, Figs. 4, 5) ; fore 

 tarsus with long and dense hairing, the length of which exceeds at 

 longest part three times the diameter of the tarsal joints. In other 

 respects similar to ciiliciformis. 



Length, 4 mm. 



I have seen only two examples of this species. These are from 

 Lake Delavan, Wis., but in all probability it occurs in Illinois also. 

 The early stages are unknown to me. 



5. Protenthes cearipexnis, n. sp. 



The male of this species resembles very closely .that of ciilici- 

 formis, differing in having the legs entirely black, the hypopygium 

 with the apical portion as in Figure 7, Plate XXVII, and the wings 



