on the Hphemeride. 133 
costam duosque nervorum sequentium fusco marginatis. 
Pedum antici fusci; posteriores fulvo-lutei, apicibus 
tibiarum et articulorum tarsalium fuscis. Abdomen supra 
fuscescens. 
@. Ale eis maris simillime, sed juxta bases lutea. 
Pedum antici brunneo-lutei; posteriores lutei, apicibus 
tibiarum ultimisque articulorum tarsalium subfuscis. 
long. corp. ¢ 10; 9 7-10 ;,al. ¢ 15, 9 18-17: sot. 
6 20 & 2, 2 15 & 1, subim. 12-13 & 1 mm. 
Hab.—Otago, New Zealand. 
Coloburus haleuticus, nov. sp. 
(Forceps maris, Pl. VI. fig. 7, 7a.) 
Imago, v. s. s. ¢@. Thorax supra furfurosus. Alex 
vitrine, lacteo tinctz, juxta bases subfusce, nervis atro- 
piceis; apices ares marginalis et arez submarginalis 
virescenti-grisei1. Pedum antici rufo-picei; posteriores 
brunneo-lutescentes. Abdomen supra rufo-fuscum, junc- 
turis paulo obscuris, lineis spiracularibus testaceis, ven- 
tre rufo-lutescenti. Sets fuscee, pubescentes: forceps 
testaceus, apices versus piceo tinctus. 
Long. corp. ¢ 11, al. 15, set. 20 & 5 mm. 
Hab.—Melbourne (?) [M’Coy]. 
Genus Cronicus, noy. gen.* 
Baetis, p., Pict. 1854. 
Imago. Heptagenie affinis. Forcipis maris pedes 
quadri-articulati; articulorum penultimus longus, secundo 
vix brevior, primus et ultimus brevissimi. Setarum 
media brevissima. 
Cronicus anomalus. 
(Forceps, Pl. VI. fig. 8.) 
Baetis anomala, Pict. 1854. 
Long. corp. ¢ 10, exp. al. 20 mm. 
Species in electro. 
* Derivation.—Kpovikos, old-fashioned, out of date. 
