481 



This species differs from prasinus Meigen, a European species re- 

 corded from North America, in having the basal joint of the fore tarsi 

 more than 1.5 times as long as the fore tibire ; in prasinus it is said to 

 be about 1.25 times longer. 



Early stages and female unknown. 



62. Chironomus similis Johannsen 



Chironomus similis Johannsen, Bull. 86, N. Y. State Mus., 1905, p. 236. 



I have not seen the male of this speices, and refer to it only one 

 female, which differs from scrus in being smaller, 3 mm., and in hav- 

 ing the fore tarsi less distinctly elongated, the basal joint being about 

 one and two thirds times as long as the fore tibiae. 



Illinois localities: Chicago (Johannsen), and Dubois, April 24, 

 19 14 (C. A. Hart and J. R. Malloch). 



The early stages are undescribed. 



Professor Johannsen informs me that the type specimen of simi- 

 lis has been destroyed and that he has no other available for com- 

 parison. In this case the female described herewith may be accepted 

 as the neotype. 



63. Chironomus cristatus Fabricius 



Chironomus cristatus Fabricius, Syst. Antl., 1805, p. 39. 



This species resembles decor us in coloration and size, differing 

 in having the antennal plumes unicolorous, the vittse brown, and the 

 abdomen with broad brown fascise on the segments, which reach to 

 base of each and are produced posteriorly slightly along the median 

 line. The legs are much more distinctly marked with brown, the 

 knees, and especially the bases of the fore tibiae being noticeably 

 browned. The basal joint of the fore tarsi is much more than one 

 half longer than fore tibiae (87:55). In other respects as decorus. 



Length, 7-8 mm. 



Illinois locality, Easton, May i, 1914 (C. A. Hart and J. R. Mal- 

 loch). 



Johannsen has recorded this species from the following states: 

 New York, Illinois, Washington, Kansas, Idaho, South Dakota, and 

 New Jersey. 



The early stages are undescribed. 



64. Chironomus serus, n. sp. 



Male. — Yellowish green, opaque. Head yellow, antennae fuscous, 

 base of flagellum yellow, plumes bicolored, sometimes forming dis- 



