391 



Keiffer has erected a new genus (Clinotanypus, Rec. Ind. Mus., 

 Vol. 9, 191 3, p. 157) for species with the fourth tarsal joint obcor- 

 date, retaining the name Procladiits for species having the fourth 

 tarsal joint linear. I have not seen Skuse's original description of 

 Procladius, and for the time being retain this name for our species, 

 although our species have the fourth tarsal joint obcordate. 



The keys given herewith will serve to distinguish the imagines of 

 the Illinois species of Procladius. 



Key to Species 



FEMALES 



1. Fourth tarsal joint elongate; small yellow species, 3-3.5 mm.; 



mesonotum with 3 reddish vittse Protentlies hellus*. 



— Fourth tarsal joint obcordate ; larger species, 4-4.5 mm 2 



2. Petiole of cubitus one third as long as lower branch of that vein . . 



1. tlioracicus. 



— Petiole of cubitus about as long as its own diameter 3 



3. Mesonotum with the disc glossy black, lateral anterior margins and 



prescutum creamy white 2. scapularis. 



— Mesonotum reddish yellow with 3 reddish vittas, the posterior ex- 



tremities of the lateral vittas and a spot on each side of scutellum 

 deep black 3. concinnus. 



MALES 



1. Fourth tarsal joint elongate Protentlies hellus*. 



— Fourth tarsal joint obcordate 2 



2. Abdomen black and white annulate, petiole of cubitus extremely 



short 2. scapularis. 



— Abdomen with apices of segments pale, but not conspicuously an- 



nulate 3 



3. Petiole of cubitus one third as long as lower branch of that vein. 



1. tlioracicus. 



— Petiole of cubitus about as long as its own diameter 



3. concinnus. 



I. Procladius thoracicus Loew 



Tanypus thoracicus Loew, Berl. Ent. Zeitsehr., Vol. 10, 1866, p. 4. 



Male. — Yellow, shining. Head yellow, obscured with brownish; 

 antenna; brown, plumes pale brown; face and palpi yellow. Thorax 



*For description see p. 388. See also p. 382. 



