MAY FLIES AND MIDGES OF NEW YORK 267 



gg Fore metatarsus 0.6 as long as its tibia; female with a 



peculiar egg guide, pl.33, fig.7 12. a b s u r d u s n. sp. 



tt Fork of cubitus distad of crossvein 



g Ri^ enters the wing margin far proximad of tip of CUi; 



length 1.25 to 2 mm. (Greenland) 13. claripennis 



gg R4+5 enters wing margin distad of CUi 



h Small blackish species 1 to 1.5 mm. long ; fore metatar- 

 sus a little shorter than its tibia 14. m i n u t u s 



Jih Species 2 to 2.5 mm. long ; greenish black ; fore metatar- 

 sus a little over one half as long as its tibia 



15. f u g a X n. sp. 

 cc Legs fuscous or black ; thorax of male usually not striped ; 

 antennae black 

 d Small black species 1 to 1.5 mm. in length ; fore metatarsus a 



little shorter than its tibia 14. m i n u t u s 



dd Larger species 2.5 to 3 mm. in length 



e Fourth tarsal joint obcordate, shorter than the fifth. (For 



description see genus Thalassomyia) platypus 



ee Fourth tarsal joint linear 



f Fore metatarsus at least three fourths as long as its tibia 

 g Anterior tarsi of the male densely hairy ; wings white ; 

 veins fuscous at base; abdomen subshining black; length 



3 mm 16. pubitarsis 



gg Fore tarsi of the male nearly bare ; last three abdominal 

 segments with pale margins ; thorax of the female 

 striped. (Compare also sordidellus) 



3. frigidus 

 ft Fore metatarsus not more than two thirds as long as its tibia 

 g Wings whitish hyaline, a little darker in the female ; abdo- 

 men fuscous, with fuscous hairs 



17. o b u m b r a t u s n. sp. 



gg Wings cinereous ; abdomen velvet black with the margins of 



the segments shining black ; fork of the cubitus under or 



but very slightly beyond the crossvein 18. b a s a 1 i s 



Note — Consult' also the auxiliary key of Walker's species on p.l98 



1. Orthocladius par Coquillett 



1901 Orthocladius Coq. Proc. U. S. Nat. Mus. 23 : 608 



Male. Yellow, the antennae except the basal joint, apices of 

 front femora, of their tibiae and of their first two tarsal joints, 

 the whole of the remaining joints, also the last two on the other 

 tarsi, brown ; a pair of rather large black spots on abdominal seg- 

 ments two to eleven (sic.) ; mesonotuni marked with three darker 

 yellow vittae, hairs of antennae bright yellow, becoming brownish 

 at their apices; front tarsi destitute of long hairs, the fourth joint 

 more than one third as long as the first ; wings bare, whitish hya- 

 line, the portion in front of R^ and R^^.- dark gray, the veins 

 brownish ; length 6 mm. Riverton, N. J. Coquillett, loc. cit. 



