477 



Plate XXXIV. Legs slender; fore tarsi bare, the basal joint two 

 thirds longer than the fore tibiae (50:30) ; mid and hind legs rather 

 long, but not densely haired. Third vein ends as far before apex of 

 wing as fourth does behind it ; cubitus forks very slightly beyond cross 

 vein. 



Length, 4.5 mm. 



Illinois localities : Havana, April 28 to May 2, St. Joseph, May 3, 

 and Dubois, April 24, 19 14 (C. A. Hart and J. R. Malloch). 



Originally described by Say from Pennsylvania, and subsequently 

 recorded from New York and New Jersey. I have seen a specimen, 

 in rather poor condition, from Attica, Ind., July 12, 1914 (C. A. 

 Hart). 



57. Chironomus indistinctus, n. sp. 



Larva. — L"'^ndescribed. Color given as reddish by Johannsen. 



Pupa. — Length, .3 mm. Greenish or yellowish. Transverse row 

 of setul?e at apex of second segment not extending to lateral margins, 

 the setulse rather large and pale ; segments 3-6 with two approximated 

 pear-shaped groups of short setulae as in Figure 13, Plate XXXI, lat- 

 eral posterior process of eighth segment as in Figure 14. 



Imago; Male. — Darker than modeshis, the thoracic vittae and post- 

 notum usually reddish, the abdomen often dark green or even fuscous, 

 the fore knees usually brownish, and the apices of fore tibiae, of the 

 basal two tarsal joints, and the last three tarsal joints entirely, brown. 

 The cross vein of the wing is clear. 



Basal joint of fore tarsi two thirds longer than fore tibiae. Hypo- 

 pygium similar in general appearance to that of modcstus, differing 

 principally in having the apical portion of the lateral arm more slender, 

 the superior process much less dilated at apex (PI. XXXIV, Fig. 6), 

 and the inferior process more rounded (Fig. 7). 



Female. — Agrees in color with the male except that the abdomen 

 is generally paler. 



Length, 2.5-3 ^^• 



Type locality, St. Joseph, 111., May 3. Swept from vegetation 

 along the bank of Salt Fork by Mr. Hart and the writer. Paratypes 

 from Havana, the same collectors, all in 19 14. 



Pupae were obtained by the writer from Thompson's Lake, near 

 Havana, April 27, 19 14. 



This is the species that Johannsen described briefly from New 

 York as variety a of modestus. He indicated that while the imagines 

 are very closely related the larvae and pupae are much more distinct 



