\ul. XXVlJ ENTUMOLOClCAt .NKH.s. 12$ 



deep blown in the middle. It was expected that the water 

 would disappear by seepage, the hole being afterwards filled 

 with large stones. From observations made at the two lo- 

 calities where it was tried it can be state<l that the results 

 were unsatisfactory. 



Several creeks receiving sewage from adjoining sections 

 furnished most of the open air breeding places. Along the 

 edges where the water had come almost to a standstill, on ac- 

 count of broken banks and stomvbrokcn trees, great colonies 

 of Cuiex pipitKs were observed. Some of these colonies were 

 from one to two feet long and a foot wide, the lar\'ae being 

 so close to each other as to discolor the water and form a 

 solid mass. In some sections a few men were employed to 

 clear out the tree stumps and establish a better flow of water. 



At one time large swarms of mosquitoes were observed at 

 one of the sewer outlets. Upon investigation it was found 

 that a wheelbarrow, which had been left by one of the work- 

 men about 30 feet inside the sewer, was impairing the flaw 

 of sewage and forming a breeding pool. 



In the southern part of the city a chemical factory discharg- 

 es its waste water into the meadows and this favors the breed- 

 ing of saltmarsh Mpeam, Several small pools in this section 

 formcfl by heavy rains only and a pool in a dyc-|K}lluted creek 

 contained millions of larvae of Aedes sollicitans and A. tatn- 

 wrhynchus. Psoropkora cUiaia was found abundantly in 

 swampy parts in company with Aedes xyhrestris and Cuiex 

 pipitns. Only a few specimens of Aedes jomaicensis and 

 Aedes triseriatus were collected and Aedes canadensis, Cuiex 

 rt'stuans. Cuiex salinarius .ind Coqueilittidia perturbans were 

 found scattcrc<l in the suburbs. Anopheies punctipenms lar- 

 vae were found in all of the smaller runs, in cattle footprints, 

 in meadows and near stables, often breeding in the same re- 



ceptarl** wiili Cul^r HpitHS. 



A P r so ccu pisd Spwific NaoM in Tipula (Dipt.). 

 Having inadvertently applied th« name suspfita tn a newly described 

 ^l'<• \ys of Tipula in niv recent |>a|>er. rntitletl "On the llebn Group of 

 ill' I >ipteruiu Genus Yipula Linnam^ " ilir name Iwing prcocatpicd by 

 / I'K.'.i sMspecUt Locw. I wish to .1; name Tifmla aWUcta for the 



spi-cics in question. — W. G. Dirr/, n. Pa. 



