-1 897-] ENTOMOLOGICAL NEWS. 145 



pubescent lobes with a slight emargination between; anteriorly it is densely 

 clothed with gray hair; ovipositor yellowish inconspicuous, as long as 

 ventral plate, almost straight. 



Described from two specimens taken at Olympia, Wash. , during 

 the months of April and July respectively, and from thirty speci- 

 mens taken at Seattle, Wash., during the month of April. 



In P. pacifica and P. elegans the wings are folded roof-like 

 over the back when at rest, but in P. olympia they are spread 

 horizontally. 



In dissecting these delicate little flies several points were ob- 

 served which may be of interest. 



The ventral nerve cord of the abdominal region is double, the 

 two bands being united only at the ganglia. This ladder-like 

 arrangement of the nervous system probably points like the vena- 

 tion of the Psychodidse to a generalized condition. 



The ovaries are two in number and lie on each side of the ab- 

 domen, each resembling a bunch of grapes. The undeveloped 

 eggs are oval and exhibit the usual arthropod condition of a cen- 

 tral yolk and peripherally distributed protoplasm. They seem 

 to develop considerably before being laid, as females were dis- 

 sected which contained eggs in a much more advanced condition; 

 these were oval, about .2 mm. long, nearly one-half of the egg 

 being occupied by a dozen or more large embryonic cells, with 

 prominent nuclei and nucleoli, which arched over the remaining 

 yolk in a dome-like manner. 



The study of antennae which had been cleared and mounted 

 in balsam brought to light some peculiar structures which are 

 undoubtedly organs of special sense. In P. pacifica and P. ele- 

 gans there is a small circular protuberance on each side of every 

 node of the antennae, except those at the tip and base. From 

 the apex of each of these elevations three long, slender processes 

 spring out, two of them projecting divergingly forward to the 

 base of the joint in front, and the third projecting backwards to 

 the node of the joint behind. On examining the antenna of P. 

 olympia for homologous structures it was found that here the 

 conditions were quite different. On each side of the joints of 

 the antennae circular depressions were found, and springing from 

 the centre of each of these were two beautiful lanceolate wing- 

 like structures, which, from their longitudinally ribbed appear- 

 ance, would seem to be either enormously developed scales, or 



