452 



that the apices of the abdominal segments are without the small warts, 

 only the basal four blackened, and in the form of the hypopygium (PI. 

 XXXIV, Fig. i8), the inferior and superior processes being much ab- 

 breviated. The basal joint of fore tarsi is about one and a half times 

 as long as fore tibiae (66: 45, 75: 50, 2 specimens). Otherwise as 

 festivus. 



Type locality, Havana, 111., September; two males. 



Early stages unknown. 



32. Chironomus frequens Johannsen 



Chironomus frequens Johannsen, Bull. 86, N. Y. State Mus., 1905, p. 230. 



Male. — Green, slightly shining. Head yellowish ; antennas yellow, 

 flagellum brown except at base, the plumes pale brown. Thorax in liv- 

 ing specimens greenish, becoming yellow after death, vittse very little 

 darker than the ground color; postnotum not darker than scutellum. 

 Abdomen without markings. Legs green or yellowish ; apical third of 

 fore tibiae and extreme apices of mid and hind pairs, apical third of 

 basal joint of fore tarsi, base and apex of second joint, and remaining 

 joints blackish brown, the pale portion of the tarsi of fore legs whit- 

 ish; mid tarsi blackened on apices of the basal two joints, as also are 

 the whole of their apical three; hind tarsi blackened on the apices of 

 the basal three joints, as also are the whole of the apical two. Wings 

 clear, veins yellow, cross vein not infuscated. Halteres green. 



Frontal tubercles absent. Pronotum linear on upper half. Hypo- 

 pygium as in Figure 6, Plate XXXIII. Fore tarsi with long delicate 

 hairs; basal joint about a fourth longer than fore tibise (56:45). 

 Third vein ending as far before apex of wing as fourth does behind it; 

 cross vein at middle of wing; cubitus forking slightly but distinctly 

 beyond it. 



Female. — Agrees in color with the male with the following excep- 

 tions : the general color is a deeper green, the last antennal joint only 

 is fuscous, the mesonotum is generally unicolorous, and the legs have 

 the dark marks more intense and rather broader. 



Length, 3.5-4.5 mm. 



Illinois localities : Havana, June 5, 1896 (C. A. Hart); Peoria, 

 June 15, 1 914, on window in hotel (J. R. Malloch). L have seen speci- 

 mens of this species from Ithaca, N. Y., the original locality, submit- 

 ted by Professor Johannsen. 



The earlv stages are undescribed. 



