1914] W eiss—Thermal Conductivity of Cocoons 45 
Rostrum and palpi brown; scape of antenna light yellowish-brown, the basal 
segment slightly darker than the second segment; flagellum broken. Front, 
vertex and occiput dark-colored, thickly bluish-grey pruinose. Frontal tubercle 
prominent, not notched. 
Mesonotum yellowish-brown, shiny, a narrow deep brown line on either side of 
the broad dorsal median portion, beginning above the pseudosutural region, nar- 
rowing behind and ending before the transverse suture; a large rounded brown 
spot on the sides of the sclerite before the transverse suture; scutum, scutellum 
and postnotum yellowish-brown with a faint greyish bloom; a rounded darker 
brown spot on the lateral lobes of the latter. Pleure very light yellow, a large 
rounded brown spot on the mesopleurze underneath the wing-root and less distinct 
spots on the propleure and cervical sclerites forming an interrupted dorso-pleural 
band. MHalteres deep brown. Legs: coxe and trochanters light yellow; femora 
yellowish-brown, extreme tip darker brown; tibiz brown; fore metatarsus brown 
on basal two-fifths, remaining portions of fore tarsi pure white except the last 
segment which is brownish; middle leg, with the basal third of the metatarsus 
brown; metatarsus of the hind legs entirely white. Wings: subhyaline or slightly” 
tinged with darker, especially toward the tip; veins dark brown. Venation, see 
figure 2. 
Abdominal tergum with the segments dark brown; segment 1 pallid at base, 
darker apically; extreme margin of segments 2-6 pallid; 7-8, not pale at tip; 
& hypopygium reddish-brown; sternites dull yellow. 
Holotype, &. Patalue, Guatemala, Central America. 700 ft. (Dr. G. Eisen.) 
Allotype, 2, with the type. Received at the National Museum, January 6, 1903. 
Type in U.S. Nat. Mus. Coll.; allotype in author’s colléction. 
EXPLANATION OF PLATE IV. 
The figures are all drawn to scale by means of a projection microscope. 
Fig. 1. Eriocera kaieturensis sp. nov.; wing. 
Fig. 2. Penthoptera conjuncta sp. noy.; wing. 
Fig. 3. Hriocera cornigera sp. noy.; wing. 
Fig. 4. Eriocera macrocera sp. noy.; wing. 
Fig. 5. Eriocera peruviana sp. nov.; wing. 
Fig. 6. Eriocera longistyla Alex; wing. 
Fig. 7. Eriocera magnifica sp. nov.; wing. 
Fig. 8. Eriocera perpulchra sp. noy.; wing. 
THERMAL CONDUCTIVITY OF COCOONS. 
By Harry B. WErss, 
New Brunswick, N. J. 
With a view toward determining the value of cocoons as a pro- 
tection against extremes of temperature, thermometric tests of 
those of quite a number of species were made in the following man- 
ner: Normal empty cocoons were selected and the bulbs of ther- 
