1881 . j 
11)7 
half, in $ about three-fifths, as long as the femur, the 3rd joint in £ 
as long as the 2nd. Nymph agile, with seven pairs of single abdominal 
tracheal branchiae, all nearly alike in form, viz. : obtusely ovate or 
obovate, and traversed lengthwise by a pinnately branched trachea, 
irregularly subdivided. The median seta is usually about three-eighths 
as long, the lateral setae about three-fourths as long as the body ; but 
sometimes (e. g ., in B. amnicus ) the median seta is far more abbre- 
viated. Type, B. binoculatas , L. Distrib., Europe and Egypt, Indo- 
Malay region, Australia ; North, Central, and, perhaps, South America. 
Some species of Callibcetis and Baetis have the front border of the 
anterior wings variegated in one or in both of the sexes. 
(To be continued) . 
DESCRIPTION OF ANOTHER NEW SPECIES OF DAMASTER. 
BY GEORGE LEWIS. 
I have now from the West Coast an insular species of Daniaster 
which is very interesting to me, as tlie head and thorax show considera- 
ble divergence from the form usual in the genus. The insect comes 
from the island of Sado, where it appears to be rare, four specimens 
only being obtainable last month, and these came from the mountains 
eight miles from the coast. I characterize it as : 
Dam aster capito, sp. n. 
Nigro-viol aceus, cor pore vice lato, capite prothoracegue latioribus, 
validis , oculis subprominulis ; elytris granulosis , baud mucronatis. 
Hub. in ins. Sado. Long. corp. 18 — 19 lin. 
Head and thorax violet-black, elytra dull black ; more robust in figure than I). 
pandurus, with shorter legs, more robust tarsi, head, mandibles and thorax much 
larger. The thickness of the head gives the region of the eyes a greater space, and 
renders them much less prominent, viewed from above they project but little beyond 
the outline of the head. The thorax is somewhat quadrate, widest in the middle, 
its greatest breadth equalling its greatest length, which is lines, and the posterior 
angles are more acute than in any other described species. The thorax of D. pan- 
darus measures, in an average specimen, lines in width and 4 in length ; what D. 
capito loses in length it gains in breadth. Elytra granulose, the striae as usual 
scarcely visible. 
In speaking of the dilated tarsi in the of the northern species, 
as compared to D. blaptoides , it must be observed that in 1). rugipennis , 
JD. viridipennis, and the present species, the tarsi are stouter in both 
sexes but the difference in the and $ of any one is very little, not 
■ ’ ,% 
more than in the large southern species. 
