352 



of hind tarsi almost twice as long as second, the fifth joint without 

 spines, and the larval claws simple and about half as long as fifth tar- 

 sal joint. The head, mesonotum, and scutellum are black, pleurae, ab- 

 domen, and halteres brown. The legs are dark brown, the base and a 

 ring before apices of mid tibise, tarsi except apices of joints, and 

 fore femora wholly yellow. 



Length, 2 mm. 



Originally described from a male specimen obtained at Riverton, 

 N. J. It has not been taken in Illinois. 



ProbEzzia Kiefifer 



The species of this genus are separable from those of Beccia by the 

 absence of the femoral spines, and from those of Parahccma by the 

 sessile media. In a recent paper* dealing with the species of this genus 

 I included elegantula Johannsen and inermis Coquillett, both of which 

 I have since placed in Paraheizzia, together with a new species de- 

 scribed in the present paper. 



None of the species of this genus have been described in the early 

 stages, and the habits of the adults are unrecorded. It is safe to as- 

 sume, however, that the larvae are aquatic, as in allied genera, the 

 adults of Illinois species having generally been taken near streams, by 

 sweeping vegetation or, in the evenings, at light. 



Key to Species 



1. Apex of wing brown; third vein almost nine tenths the wing- 



length 1 ierminalis. 



— Wings clear or only slightly infuseated 2 



2. Whitish or yellowish species 3 



— Black or fuscous species 4 



3. Fulvous species ; eyes widely separated ; antenna not as long as head 



and thorax combined; fifth tarsal joint not spinose ventrally; 

 third vein four fifths the wing-length 2. fulvifhorax. 



— Yellowish white species; eyes narrowly separated; antenna II/2 



times as long as head and thorax comljined ; legs whitish ; fifth tar- 

 sal joint black, with 2 rows of long spines on ventral surface ; third 

 vein almost to apex of wing 3. pallida. 



4. Scutellum j^ellow, noticeably paler than mesonotum 5 



— Scutellum not paler than disc of mesonotum or posnotum 7 



5. Mesonotum covered with pale pruinescence and with a brown cen- 



tral vitta 4. glaher. 



— Mesonotum not vittate 6 



6. Scutellum reddish yellow, shining black at base ; abdomen light yel- 



^Proe. Biol. Soc. Wash., Vol. 27, 1914, p. 13; 



