Principal household insects of the United States . e egg mass was deposited in confine-ment. This was deposited on the morning of June 30 by a female*whichissued from the pupa June 27. No further observations were madeupon the time elapsing between the emergence of the female and thelaying* of the eggs, but in no case, probably, does it exceed a few days. 1 Even Bonanni, in 1691, gave very fair figures of the larva and pupa of a Europeanspecies. Micrographia Curiosa, Rome, MDCXCI, Pars. II, Tab. I. MOSQUITOES AND FLEAS. 15 The length of time which elapses for a generation, which we have just m
Principal household insects of the United States . e egg mass was deposited in confine-ment. This was deposited on the morning of June 30 by a female*whichissued from the pupa June 27. No further observations were madeupon the time elapsing between the emergence of the female and thelaying* of the eggs, but in no case, probably, does it exceed a few days. 1 Even Bonanni, in 1691, gave very fair figures of the larva and pupa of a Europeanspecies. Micrographia Curiosa, Rome, MDCXCI, Pars. II, Tab. I. MOSQUITOES AND FLEAS. 15 The length of time which elapses for a generation, which we have just mentioned, is almost indefinitely enlarged if the weather be a matter of fact, a long spell of cool weather followed the issuing ofthe adults just mentioned. Larva- were watched for twenty days, dur-ing which time they did not reach full growth. The extreme shortness of this June generation is significant. Itaccounts for the fact that swarms of mosquitoes may develop uponoccasion in surface pools of rain water, which may dry up entirely in. Fie. 4.—Oulexpungent: Full-grown larva a( left; pupa at right above, ita anal segment below—all greatty enlarged (original). the course of two weeks, or in a chance bucket of water left undis-turbed for that length of time. Further, the shortness of this genera-tion was, while uot unexpected, not at all in accordance with any pub-lished statements as to the length of life of any immature mosquito ofany species. But these published statements, as previously shown,were nearly all based upon observations made in a colder climate andin the month of August 1 Mr. V. (. Pratt, an assistant in the division of ento- 16 PRINCIPAL HOUSEHOLD INSECTS. mology, brought in from Lakeland, Md., a small place 9 miles fromWashington, specimens of a large and very ferocious mosquito, whichMr. Coquillett determined as Anopheles quadrimaculatus Say, a specieswhich had previously been observed at Washington in August. Thismosquito was very abundan
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