4i6 



NEW YORK STATE MUSEUM 



Leuctra tenella Provancher (pi. 15 and fig. 4 and 5) 



1878 Leiictra tenella Provaucher, Petite faune eutomologique du Canada. 



p. 802 (without description) 

 1892 Leuctra tenella, N. Banks, Aui. ent. soc. Trans. 19:343 (cited) 



This species was much less common than the preceding one. Adults 

 were not observed in flight. A few were taken in the following places : 

 at the hatchery windows ; on aquatic vegetation close above the 

 surface of the water; and under the ends of some boards which over- 

 hung the water at the railway embankment, where the water pours 

 out of the culvert, forming a little riffle. In this last mentioned place 

 the nymphs were obtained. They were found crawHng over the surfaces 

 of the stones and boards among the brown and empty cases of Simulium 

 pupae. One was bred July 31. Sweepings by day alongside the creek 

 and trap lanterns by night failed to find this species. 



From the foregoing bibliographic notes it will be apparent that this 

 species is still practically undescribed. 



Fig. 4 Leuctra tenella, male : a, dorsal view of head and prothorax ; b, end of male abdomen 



Imago. Length, male 7.5 mm, female 9 mm to tip of wings; anten- 

 nae, 5 mm. First and fourth segments of antennae of about equal 

 length, the third longer, the second shorter, about 34 segments in all; 



