208 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
resemble this species. The host plant of P. quercus is given as 
the canyon live oak, Quercus chrysolepis, and if these are of this 
species then it is worthy of note that Platanus racemosa as well 
as Quercus chrysolepis, is a host. 
MOSQUITOS AND COBWEBS 
James Zetek, Ancon, C. Z. 
During February and March, 1913, extensive breeding in a 
salt-water marsh along the old French canal caused a heavy 
influx of adults of Anopheles tarsimaculata Goeldi and Aedes 
taemiorhynchus Wiede., at Gatun, Canal Zone, about 4,000 feet 
distant. A cement shed and a store house, only 600 feet to the 
south-west from the breeding place contained many cobwebs, 
and these were so weighted down with mosquitos of the species 
mentioned, that in several cases the webs showed breaks. It is 
no exaggeration to say the cobwebs were black with these 
mosquitos. 
Another instance of mosquitos in cobwebs was seen June, 1913, 
in native shacks near Culebra, C. Z. In these there were on an 
average of six mosquitos to a web, principally Culex quinque- 
fasciatus Say and Aedes calopus Meigen. Two specimens of 
Mansonia titillans Walker, three of Aedeomyia squamipennis 
Arib. and three of Lutzia bigotii Bellardi were also noted in 
these webs. 
The last instance was noted in October, 1913, at Paraiso, C. Z., 
while with Doctor Martini and Mr. Pickett. In a single shack, 
adults of Culex quinquefasciatus Say were present in cobwebs. 
It did not appear that the spiders cared much for such food, 
probably because larger diptera were plentiful and to be had 
easily. It seems mosquitos are accidentally entrapped in these 
webs while seeking shelter in corners of buildings. 
