on the Hphemeride. 157 
Heptagenia torrida. 
Baetis torrida, Walk. 1853. 
Imago, v.s.s. @. Thoracis tergum castaneo-piceum. 
Ale vix fusco suffuse: antica areis marginali submargi- 
nalique saturatioribus. Pedum antici rufo-picei; pos- 
teriores saturate furfurosi, apicibus femorum rufo-piceis. 
Abdomen (decoloratum) apicibus segmentorum obscuris ; 
setis carens. Processus ventralis penultimi segmentorum 
integer. 
Long. corp. ? 8, exp. al. circa 20 mm. 
Hab.—The Philippine Islands. 
Heptagenia determinata. 
Baetis determinata, Walk. 1853. 
Imago, v.s. s. @. (reliquie typi). Picea. Thorax 
striga dorsali longitudinali fulva. Ale vitrine: antica 
costa’ apud basin saturate ochraced, nervis fuscis, atque 
areis marginali submarginalique quasi incrassatis et 
fuscis. Pedes furfurosi, tarsis et apicibus femorum fuscis. 
“Abdomen striga lata flavescenti, notis paucis piceis 
inclausis.”” (Walk.) 
Long. corp. ¢ 11, al. 24 mm. 
Hab.—Java. 
In this genus the cross-veinlets in the apex of the 
marginal area of the anterior wing vary in character in 
the same species, so much so, that they may be simple 
and free, or divided and conjoimed, in either sex of a 
species, indifferently. Sometimes, however, they are of 
shght service. H. elegans and some other yellowish 
species have two evanescent dark triangular dorsal 
dashes between the wings of the subimago, which I have 
purposely omitted to mention in the descriptions. 
