. The American entomologist. Entomology. Triodites mus: pupa (after Riley). he has a specimen from Washington Territory. TRionrrKs i\irs. The habits of this insect in the larva state are precisely like those of the pre- ceding, and the larva so greatly resembles that of the Systa'chiis that it is well nigh impossible to separate the two with cer- tainty. The head parts are somewhat broader, shorter and less flattened, the maxillae more blunt, the labrum paler, and the mandibles sharper and with a smoother outer edge. The thoracic joints bulge less beneath and the thoracic spiracle is more sunk
. The American entomologist. Entomology. Triodites mus: pupa (after Riley). he has a specimen from Washington Territory. TRionrrKs i\irs. The habits of this insect in the larva state are precisely like those of the pre- ceding, and the larva so greatly resembles that of the Systa'chiis that it is well nigh impossible to separate the two with cer- tainty. The head parts are somewhat broader, shorter and less flattened, the maxillae more blunt, the labrum paler, and the mandibles sharper and with a smoother outer edge. The thoracic joints bulge less beneath and the thoracic spiracle is more sunken and less conspicuous. The pupa (Fig. 150) is easily distinguished from that of Systa-cJiiis in the broader and more bulbous head, and in many structural characters. 1'he larger head and eyes, [Fis. * So far as we can ascertain there has hitherto been published no recognizable figure or description of the Bombyliid larva. Dufour, in his article above alluded to, describes that of Jicimliyliits major very indifferently, and gives a dorsal view which shows little or no relation to the larva here described, wiiile his description and figure of the mouth parts fail to in- dicate the different pieces w(- have observed in our larva;. Yet in general form and structure the true Bomhylius larva will undoubtedly be found to agree very closely with those here described. Triodites mus : female (after Riley). more slender form and short proboscis readily distinguish the fly from the Sys- ta-c/ii/s. The sexes are also readily sepa- rated by the more pronounced transverse rows of white or tawny hairs on the hind borders of the abdominal joints in the female (Fig. 151 . The genus in some degree connects the Aiithracini with the more typical Bombyliini. In certain lights the tegument reveals a greenish tinge, and the pubescence of the thorax appears generally of a tawny color. The male sometimes has a white tomentum on the front, and in some specimens there is a stump of a vein extendi
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectentomology, bookyear1
