62 MANDIBULATA. NKUBOPTERA. 



Rusty-brown : eyes black ; thorax broad, ovate, glossy ; abdomen pale ; setae 

 short, pale, pilose ; legs very pale ; wings whitish, costa somewhat fus- 

 cescent. 



Pseudimago with ashy, ciliated, wings. 



Taken in June, at Hertford. 



Sp. 6. chironomiformis. Ochracea nitida, oculis nigris, pedibus pallidis, alis 

 lacteis, costa fused. (Exp. Alar. 5 lin. ; Long. corp. 2^ lin. ; 1. set. 1 lin.) 



Br. chironomiformis. Curtis, Phil. Mag: 1834.— Cae. chironomiformis. Steph. 



Nomen. 2d edit. Appendix. 

 Shining, ochreous : eyes black; legs whitish; wings milk-white, costa 



fuscous. 



Found near London ; and at Bath, by C. C. Babington, Esq. 



Sp. 7. interrupta. Atra nitida, abdomine pallida, strigis 2-bus dorsalibus atris 

 interruptis, pedibus fuscis, alis fuscescentibus, costa saturaiiore. (Exp. Alar. 

 45 lin.; Long. corp. 2 lin.; 1. set. % lin.) 



Cse. interrupta. Steph. Nomen. 2d edit. Appendix. 



Deep glossy black : abdomen pale, with an interrupted black streak on each 

 side down the back ; filaments and legs fuscescent; wings also fuscescent, 

 with the costa darker. 



Found at Whittlesea Mere, in July 1833. 



Genus V.— BAKTIS, Leach. 



Head large, transverse, hemispherical : eyes large, united on the crown in the 

 males, remote in the females : thorax ovate, stout ; wings four, anterior 

 long, narrow, obtuse, considerably reticulated, costa slightly varied ; 

 posterior small, somewhat ovate : abdomen moderately long, rather tapering, 

 furnished at its apex with two filaments : anterior legs long, with the 

 femora compressed ; four hinder ones short ; claws dissimilar. 



The insects contained in this genus may be readily known by having 

 two filaments only at the apex of the abdomen, and at the same time 

 being furnished with two pair of wings : it is probably a more numerous 

 genus than I have indicated, but the species of this family are so 

 extremely fragile, and are so susceptible of injury, that they are 

 difficult to investigate satisfactorily, after having been long preserved 

 in cabinets, and unfortunately several of my old specimens were 

 injured by the damp, several years back, at South Lambclh. 



