66 MANDIBUI.ATA. NKUROFTERA. 



Eph. bioculata. Linnc. — Ba. bioculata. Sie/jh. Caial. 306. No. 3399. 



Ochreous-yellow : head with two largish luteous tubercles ; thorax clouded 

 with brownish ; abdomen with the basal segment brownish ; abdomen 

 with the basal segment brownish, the four following white and pellucid, 

 the remainder brownish ; legs white ; filaments also white, faintly spotted 

 with fuscous, and much longer than the body; wings hyaline, faintly 

 reticulated. 



Pseudimago pale ochreous, legs paler ; wings brownish. 



The silence of Linnaeus as to the number of wings possessed by this species is 

 fair presumption that it has four, as he expressly states " alis duabus" 

 where there are but two only ; and, as the above insect agrees in the main 

 with the Linneean definition, I consider his insect to be a Baetis. 

 Found abundantly near Hertford, in June and July. 



Sp. 13. fuscata. Fusca, abdominis medio pedibusque pallidis, setis brevibus. 

 (Exp. Alar. 6—7 liu. ; Long. corp. 3—34 lin. ; 1. set. 4 lin.) 



Eph. fuscata. Linne.—'R-A. fuscata. Steph. Catal. 306. No. 3398. 



Fuscous, shining : abdomen with the basal segment fuscous, the four following 

 - pale or whitish, the remainder fuscous; filaments shorter than the body, 

 white, immaculate ; legs pale, claws fuscous ; wings hyaline, imma- 

 culate. 

 Inhabits the vicinity of London, in June. 



Sp. 14. culiciformis. ]\igricans, ahdominefusco, pedibus pallidis, alis immacu- 

 latis. (Exp. Alar. 6 — 7 lin. ; Long. corp. 3 lin. ; 1. set. 6 lin.) 



Eph. culiciformis. Linne. — Ba. culiciformis. Steph. Catal. 306. No. 3397. 



Blackish, shining: abdomen fuscous; filaments as long as the body, pale 



lurid, immaculate ; legs pale ; wings hyaline. 

 Pseudimago pale reddish-ochre; wings yellowish-brown. 



Not uncommon in the metropolitan district, especially near 

 Hertford, in June and July. 



Sp. 15. horaria? Fusca, abdomine cinerascente, segmentorum marginibus albis, 

 pedibus pallidis, alis hyalinis, costd nigricante. (Exp. Alar. 6' — 7 lin. ; Long, 

 corp. 3 lin. ; 1. set. 4 lin.) 



Eph. horaria. Linnc. ?— Ba. horaria. Steph. Catal. 306. No. 3396. 



Fuscous, shining: abdomen ashy, with the edge of the segments white; 



filaments as long as the body, pale ; legs also pale ; wings hyaline, costa 



dusky. 



Not common : found near Hertford, in July. 



Sp. 16. verna. PuUide ferruginea, thorace piceo, ochraceo maculato, setis 

 pallidis, fusco punciatis, pedibus obscu?-is. (Exp. Alar. 7 — 8 lin. ; Long, 

 corp. 3| lin. ; L set. 7 lin.) 



