Report of first expedition to South America, 1913Members of the expedition: Richard PStrong [and others] . the abdomen each bear dorsally a series of four small hooks on each side ventrallythe fifth segment bears on each side of the middle a pair of approximate hookj>;the sixth and seventh each bear the same number of hooks, but here the hooks areequidistant from one another, the pair on each side not being approximated. Pupa No. 2 Length to mm. Very similar to the preceding form and perhaps only avariation of it. The respiratory trunk divides into two branches at the base, oneof th
Report of first expedition to South America, 1913Members of the expedition: Richard PStrong [and others] . the abdomen each bear dorsally a series of four small hooks on each side ventrallythe fifth segment bears on each side of the middle a pair of approximate hookj>;the sixth and seventh each bear the same number of hooks, but here the hooks areequidistant from one another, the pair on each side not being approximated. Pupa No. 2 Length to mm. Very similar to the preceding form and perhaps only avariation of it. The respiratory trunk divides into two branches at the base, oneof these branches again divides a very short distance beyond and the other at doublethe distance from the base; of these four filaments the dorsal one then later dividesinto two, the next remains simple. There are thus formed six twigs to the respira-tory organ. One specimen of this form was taken at Matucana, Peru, atan altitude of 7,300 feet. Pupa No. 3 Length 4 mm. Of an entirely different type from any described pupae ofSimuliidae so far as it has been possible to ascertain. Pupa case not attaining the. Fig. 8. — Simulium pupa, No. 3. Anterior aspect of the body. anterior margin of the head, more or less slipper-shaped, but rather loosely organs of very pecuHar form, arising in the usual position, but spreatlingout laterally like a ragged palmetto leaf and lying rather flat, in a plane perpenchcu-lar to the axis of the body. Viewed from the front the median margin is nearlystraight while the lateral margin though very irregular is more or less fan is composed of eighteen rays connected basally, but separate apically, at 170 ENTOMOLOGICAL STUDIES two places the clefts between the rays are much deeper, dividing the rays into threegroups of four, six and eight rays respectively; the raj^s are of nearly the samelength, except that the third ray of the first group of four and the third ray of thesecond group of six are much longer; each ray narro
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Keywords: ., bookcentury1900, bookdecade1910, bookidreportoffirs, bookyear1915
