88 Psyche [June 
Nesodermus insulanus sp. nov. 
Dark brown, irregularly dusky. Vertex of the head like the 
dorsum, but the remaining portions together with the antennze 
and legs a paler brown or brownish yellow. Prozonites ventrally 
yellow. 
Vertex and upper frontal region of head tuberculate with cor- 
responding dusky or black areolation. Other parts with corre- 
sponding areolz limited by a network of impressed lines. 
Antenne short, strongly clavately thickened distad, the fifth 
article being much the longest and thickest; sixth article next 
in thickness and length, with the seventh more slender and much 
shorter. Hairs on distal articles subdense, all very short. 
First dorsal plate with its border projecting horizontally an- 
teriorly and laterally widely beyond the head. Much longer than 
the other tergites. Caudal margin mesally straight. Border 
divided by radial sulci into 12 lobules each of which projects as a 
wide, low, rounded tooth or crenulation at the margin. Lobules 
- finely granular, the convex median portion of the plate appearing 
more coarsely and densely tuberculate. 
Sides of body parallel or nearly so excepting towards ends. 
Keels of dorsal plates large, extending laterally over the feet. Keels 
of the second tergite bent conspicuously cephalad, those of the 
next three less and less so and the remaining ones back to the eight- 
eenth with anterior and caudal margins nearly straight and par- 
allel and at right angles to the long axis of the body. Keels of 
the eighteenth segment bent caudad. Keels increasing in length 
(7. e., in longitudinal diameter) from the third caudad, those of 
the second being longer than those of the third. Each keel of the 
second plate with lateral margin showing 3 rounded teeth with 
corresponding divisions of border separated by sulci; the third 
and fourth plates with borders of keels similar but teeth better 
separated. On keels of the fifth tergite the lateral incisions of 
keels extend mesad along sulci much farther, dividing the border 
into 3 narrow, distally rounded lobes from the median of which 
projects the pale subcylindrical spiraculiferous papilla; in all suc- 
ceeding plates the anterior lobe is subdivided thus giving 4 distinct 
lobes separated by deep narrow incisions replacing the sulci of 
the most anterior plates; the most anterior lobe extending farthest 
ectad, the posterior one least. Caudal edge of keel of all plates 
