Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . d ce and E h yp li i d vc ; while the remain-ing families of this division are included in the Brachyceru. orflies with short antenna, such as the Muscidce, etc. But thefossil genera, Electra and Chryothemis, discovered bty Profes-sor Loew in the amber of the Tertiary formation, and a NorthAmerican genus of Xylophagidw , and the genus Rachieerus,have intermediate characters combining these distinctions,which are thus shown to be somewhat arbitrar
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . d ce and E h yp li i d vc ; while the remain-ing families of this division are included in the Brachyceru. orflies with short antenna, such as the Muscidce, etc. But thefossil genera, Electra and Chryothemis, discovered bty Profes-sor Loew in the amber of the Tertiary formation, and a NorthAmerican genus of Xylophagidw , and the genus Rachieerus,have intermediate characters combining these distinctions,which are thus shown to be somewhat arbitrary. Latreille. The family of Mosquitoes or Gnatshave the mouth-parts very long and slender ; the maxilla? andmandibles are free and lancet-like. Figure 274 (A, larva ; c,its respiratory tube ; B, pupa ; c?, the respiratory tubes ; o, theend of the abdomen, with the two oar-like swimming leaves,seen in profile at B, from drawings made by Mr. E. Burgess,)illustrates the transformations of a species inhabiting brackishwater in the vicinity of Boston. The larva1 remain most ofthe time at the bottom feeding upon decaying matter, thus act- Pis-. ing as scavengers and doing great benefit in clearing swampsof niiasms. Occasionally they rise to the surface for air by ajerking movement, inhaling it through the star-like respiratorytube which connects with the tracheae. The pupae have club-shaped bodies owing to the greatly en-larged thorax, with two respiratory tubes like those of Corethra,situated on the thorax. Theyremain near the surface ofthe water wriggling towardsthe bottom when disturbed,aided by the two broadswimming caudal active in their hab-its they do not eat. The eggsare laid in a boat-shapedmass, which floats on the surface of the water. About fourweeks after hatching the imago appears, so that there areseveral broods during the summer. The females alone bite,the males not coming into our apartments but spending theirlives in the retirement of the s
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects
