382 



in the Salt Fork at Homer, 111., March 21, 19 14, and successfully 

 reared in vials. This species is not described by Johannsen in the 

 immature stages, but it seems necessary to indicate that the figures 

 given by him for Procladius adumb?'atus (1-5 of Plate XX of his 

 work previously cited) are in practically all particulars identical with 

 those given herewith and drawn from cast larval skins of culiciformis. 

 It is probable that the two species are very similar in the larval stage, 

 though the only species of Procladius which I have reared has a very 

 differently constructed larva. Bellus has occasioned me considerable 

 trouble, and has been located here because of its general habitus rather 

 than its possession of the surface hairs of the wing, which are remark- 

 ably weak, and in some cases, where the specimen may have been in 

 alcohol or in some way become wtt, are practically indistinguishable. 

 This applies also to ripariiis. 



Key to Species 



1. Wings with distinct blackish spots in addition to the spot on the 



cross vein 2 



— Wings without any spots except the spot on cross vein, or with in- 



distinct clouding ; 3 



2. Spots on wings almost black, a very distinct spot over the cross vein 



and extending well into first posterior and median cells; almost 

 black species with the thorax white pollinose between the vittaB ; the 

 pale and dark color of legs sharply contrasted. ... 1. stellatus. 



— Spots on wings grayish, the spot over the cross vein not extending 



distinctly into first posterior cell ; yellowish species with brown 

 thoracic vitts ; leg colors not sharply contrasted. 2. punctipennis. 



3. Wings with apical half and anterior margin of basal half grayish, 



the cross vein blackened, a clear patch before and beyond the 

 cross vein 3. culiciformis. 



— Wings with only the cross vein blackened 4 



4. Basal joint of fore tarsus over two thirds as long as fore tibia 



4. cJioreus. 



— Basal joint of fore tarsus slightly more than half as long as fore 



tibia 5 



5. Dark species, thorax, abdomen, and legs of male almost entirely 



black ; hypopygium similar to that of culiciformis 



5. claripen7iis. 



— Pale species, thorax, abdomen, and legs almost entirely yellow ; hy- 



popygium as in Figures 12, 7, Plate XXVIII 6 



6. Thorax pale reddish yellow, the vittse reddish or brown 



6. hellus*. 



— Thorax pale lemon-yellow, the vittae black or dark gray 



7. riparius. 



*I have placed this species in Protenthes because in some cases there are weak 

 hairs discernible on the wings, and the fourth tarsal joint is elongate — not obcordate. 



