418 Annals Entomological Society of America [Vol. V, 
The caudal extremity of the last segment is laterally compressed and is 
equipped with two pairs of spines, one dorsal and the other ventral in 
position. The former is only moderately developed while the latter is 
strongly developed. The spines in both pairs diverge caudad and in 
each pair the component spines are separated by a distinct emargination. 
This pupa differs from that of Ps. schizura in the length and 
diameter, in the number of abdominal spines, the character of 
the intersegmental grooves, and the character of the head 
region. It differs from the pupa of Ps. floridica chiefly in the 
character of the respiratory tubes and the number and arrange- 
ment of the abdominal spines. The pupa of Ps. nocturnala 
differs in the number of rows of spines on the first abdominal 
segment, and in size. The pupa of Ps. domestica differs markedly 
in the shape of the abdomen, in size and in the character of the 
abdominal spines. 
Studies on the structure and activities of the different 
stages of this species are now in progress and the results will be 
published later. 
The writer considered it unnecessary to give a complete 
bibliography of the literature on Psychodide. ‘The following 
list includes only the papers referred to in the article. 
LITERATURE CITED. 
Dell, J. A. 1905. Structure and Life History of Psychoda sexpunctata. Transac- 
tions of the Entomological Society of London, pp. 293-311. 
Fullaway, D. T. 1907. Immature Stages of a Psychodid Fly. Entomological 
News, Vol. XVIII, pp. 386-889. 
Haseman, L. 1907. A Monograph on the North American Psychodidae, including 
ten new species and an Aquatic Psychodid from Florida. Transactions of the 
American Entomological Society, Vol. XX XIII, pp. 299-333. 
1908. Notes on the Psychodidae. Entomological News, Vol. XIX, pp. 274-285. 
Kellogg, V. L. 1901. An Aquatic Psychodid. Entomological News, Vol. XII, 
pp. 46-50. 
Miall, L. C., and Walker, N. 1895. The Life History of Pericoma canescens, 
Transactions of the Entomological Society of London. pp. 141-147. 
EXPLANATION OF PLATES. 
PLATE XXXI. 
Psychoda albimaculata, n. sp. 
Fig. 1. Dorsal view of the pupa. 
Fig. 2. Ventral view of pupa. 
Fig. 8. Eggs. Drawn shortly after oviposition. 
Fig. 4. Basal joints of the antenna. Hairs and scales not shown. 
Fig. 5. Distal joints of the antenna. Hairs and scales not shown. 
PLATE XXXII. 
Fig Dorsal view of the mature larva. 
6 
7. Dorsal view of the male genitalia. Hairs not shown. 
Fig. 8. Lateral view of the male genitalia. Hairs not shown. 
. 9. Dorsal view of one of the pupal respiratory tubes. 
Fig. 10. Ventral plate of the female. 
Fig. 11. Ovipositor. 
