106 THE CANADIAN ENTOMOLOGIST. 



C. With a single eye-patch on each side of the head. 



D. Third and fourth abdominal segments subequal above. 



E. Denies not extending beyond the ventral tube. . . .Isotoma, Bourl. 

 EE. Dentes extending beyond the ventral tube . Corynothrix^ , Tullb. 

 DD. Fourth abdominal segment three or four times longer than the 



third. 



E. Mucrones falcate, not with an anteapical \.oo\\i.,Drepanura\, Schott. 

 EE. Mucrones not falcate, with an anteapical tooth. 



F. Eyes arranged promiscuously, not in two straight longitudinal and 

 • four transverse rows Entoinobrya, Rond. 



FF, Eyes arranged symmetrically, in two straight longitudinal and 



four transverse rows Saiina, MacG. 



CC. With two eye-patches on each side of the head Sineila, Brooks. 



BB. Antennfe six-jointed Orchesella, Temp. 



AA. Body clothed with flattened scales. 



B. Antennae four-jointed. 



C. Apical segments of antennre ringed. 



D. Eyes present, twelve, six on each side of the head. Tomocerus, Nic. 



DD. Eyes wanting Tritomurus, Frau. 



CC. Apical segments of antennae simple, not ringed. 



D. Eyes wanting Beckia, Lub. 



DD. Eyes present, sixteen, eight on each side of the head. 



E. Mesonotum simple, head exposed Seira, Lub. 



EE. Mesonotum projecting over the head and in part concealing 



it Lepidocyj-tus, Bour. 



BB. Antennae five-jointed. 



C. Eye spot with a single ocellus ; apical segment of the antennae 

 ringed Templetonia, Lub. 



CC. Eye spot with eight ocelli ; apical segment of the antenna? 

 simple Stro7igylo7iotiis, MacG. 



*Tiillberg erected this genus for the reception of a species from Nova Zembla, C. 

 borealis, Tullb. The characters separating it from Isotonia are certainly superficial. 



+ As the description of this genus may be inaccessible to many, it is appended : 

 " Mesonotum non prominens. Segmentum abdoniinale quartum triplo vel quadruplo 

 longius quam tertium. Antenna' dimidia parte corporis breviores, quadriarticulata, 

 articulo secundo et tertio inter se fere aequalibus, cjuarto omnium longissimo. Oaelli 

 i6 ; 8 in utroque latere capitis. Pili clavati praecipue in regione cervicis et in seg- 

 mentis apicalibus stipati. Mucrones furculae parvi falciformes. Squama? Type, 

 DrepaniDa calif oniica, Schott. 



