THe BIOLOGY OF THE CHRYSOPIDAE 1367 
Pupa.—Normally within white silken cocoons, the packet of larva often 
covering practically all of the cocoon. Pupae have not been found out of doors 
by the writer. Greatest diameter of cocoon, 2.9 mm.; least diameter, 2.3 mm. 
Adult (fig 163).—The adults collected and reared con- 
form rather closely to the original description by Banks 
(1903), but differ chiefly in the following minor charac- 
teristics: head largely ivory-colored, less commonly with 
a greenish tinge instead of yellowish; black lines to 
mouth not connecting, though the labrum is light brown; 
no red on anterior lobes of prothorax; cross-veinlets of 
Wings very dark, the adjacent cells of many appearing 
smoky nearest the veins; length from head to tips of 
wings, 10 to 12 mm. 
Other trash carriers 
From a study of the cocoons in the collection of Fic. 163. HEAD AND 
Chrysopidae in the Museum of Comparative Zool- PROTHORAX OF ADULT 
ogy at Cambridge, the following additional species QF FREES>P* COC 
are apparently trash carriers also: Allochrysa par- ‘ 
vula Banks and Leucochrysa floridana Banks. 
BIBLIOGRAPHY 
ALDERSON, E. Maupr. Notes on Chrysopa dorsalis, Burm. Ent. mo. 
mag. 47: 49-54. 1911. 
Banks, NatHan. A revision of the Nearctic Chrysopidae. Amer. Ent. 
Soe. Trans. 29:187-162. 1903. 
Catalogue of the menropreroid insects (except Odonata) of the 
United States, p. 1-53. 1907. 
— Miscellaneous notes. Ent. Soc. Washington. Proc. 17:146- 
147. 1915. 
BowERBANK, J. S. Observations of the circulation of blood and the 
distribution of the tracheae in the wing of Chrysopa perla. Ent. 
mag. 4:179-185. 18387. 
BRAvER, FrrepricH. Ueber den Farbenwechsel von Chrysopa vulgaris 
Schn. Zool.-Bot. Ver. Wien. Verhl. 2 (1852) :12-14. 1853. 
— Hier und Larve von Chrysopa pallida Schneid. K. K. Zool.- 
Bot. Gesell. Wien. Verhl.17 (Abhandl.) :29-30. 1867. 
BuRMEISTER, HERMANN. Handbuch der Entomologie, 27: 397-1050. 
(Reference on p. 976-983.) 1839. 
