52 AGRICULTURAL EXPERBIENT STATION. 



Beach Haven— Collected on the nth of Jvme, 1903; examined on the i8th' 

 of June. Larva No. i, Navicula Vegetable fibre. Amorphous matter; larva- 

 No. 2, Navicula, Cyclotella, Protococcus, Vegetable fibre; larva No. 3, Navi- 

 cula, Insect scales. Vegetable fibres. 



Culex pipicns — Collected from Jersey City ; no date ; preserved in alcohol. 

 Larva No. i, Synedra (many), Navicula (many), Surirella, Protococcus, Con- 

 ferva, Oscillaria, Cosmarium; larva No. 2, Synedra (many), Navicula 

 (many), Cyclotella, Protococcus, Cosmarium. Vegetable fibre. 



Morristown, N. J.— Collected on the 17th of June and examined on the 23d 

 of June, 1903. Larva No. i, Surirella, Navicula, Insect scales. Vegetable 

 fibres (many) ; larva No. 2, Epistylis, Euglena, Arcella, Navicula, Vegetable 

 fibre ; larva No. 3, Arcella, Epistjdis, Navicula, Synedra, Insect scales. Vege- 

 table fibre. 



Collected on the 2d of July and examined the 8th of July. Collected in 

 pails from New Brunswick. Preserved in alcohol. Examination of several 

 larvae showed that the chief food was a filamentous alga of some kind, with a 

 few Difflugia and diatoms. 



Culex tcrritans — Sample from the east side of Raritan river. New Bruns- 

 wick. Collected the 7th of July and examined on the iSth of July. Larva No. 

 I, Pinnularia, Stauroneis, Pleurosigma, Phacus, Debris of filamentous algse; 

 larva No. 2, Pinnularia, Navicula, Staureneis, Debris of filamentous algae. 



Anopheles punctipennis — Sample from New Brunswick, N. J. Larva No. i,. 

 Eunotia, Oscillaria, Closterium, Navicula, Conferva, Gomphonema, S.vnedra, 

 Scenedesmus, Docidium, Botrj'ococcus, Insect scales, Vegetable matter ; larva 

 No. 2, Cosmarium, Synedra, Pinnularia, Conferva, Raphidium, Closterium,. 

 Sand-grains. 



C. territans — Larvse were examined and found to contain nothing but a fila- 

 mentous alga of some sort, probably Conferva. Larvae from Sicard and Mor- 

 rell streets. New Brunswick, had developed into pupae when received, so the 

 results were part inductive ; but their food was entirely vegetable. A sample 

 of red mud from Richardson street gutter. New Brunswick, was swarming 

 with bacteria and a ciliated protozoan of some sort. There were no diatoms 

 or algas. 



Culex puiigcHS — From New Brunswick. Fed almost wholly on the minute 

 ciliated infusorian of a green color. Species not determined. 



Anoplieles punctipennis — Larva No. i, Ciliated green infusorian, Cyclotella, 

 Conferva, Scenedesmus. 



Culex pungens — Larva No. 2, Ciliated green infusorian, Pleurosigma, Scene- 

 desmus, Raphidium, Pediastrium. 



Respectfully submitted, 



HORATIO N. PARKER. 



In addition to this formal report Mr. Parker's letters contain 

 reports on special lots sent him from time to time, and occasional 

 remarks of interest and value. 



Under date of June 24th, commenting- on the specimens from 

 Morristown, he says: "This is a very interesting lot, for in 

 Bpistylis Arcella and Biiglcna we have animal food. I have 

 been expecting that the Protozoa are utilized by the mosquito 

 larvse for food and I am glad to find a demonstration of my 

 suspicions. 



"Of course this animal food is much more perishable than the 

 vegetable, so that we may be giving undue weight to the pro- 

 portion of vegetable food in the intestine. I do not think we 

 could find the Protozoa in preserved specimens so that I am 



