. Smithsonian miscellaneous collections. ian vessels and which are always more filiform in origin of the Malpighian vessels marks the posterior limit of themid-intestine. These are rather narrow, long tubelike vessels, stronglyentangled around the posterior part of the mid-intestine and do notvary noticeably in size. Hind-intestine.—While the fore- and mid-intestine are situated asa straight tube in the body, the hind intestine forms a distinct latter does not bear any gastric coeca but is characterized by themuscles which enclose it. The subdivisions, the small and large in
. Smithsonian miscellaneous collections. ian vessels and which are always more filiform in origin of the Malpighian vessels marks the posterior limit of themid-intestine. These are rather narrow, long tubelike vessels, stronglyentangled around the posterior part of the mid-intestine and do notvary noticeably in size. Hind-intestine.—While the fore- and mid-intestine are situated asa straight tube in the body, the hind intestine forms a distinct latter does not bear any gastric coeca but is characterized by themuscles which enclose it. The subdivisions, the small and large in-testine and the rectum, are not so clearly separated. The ovaries ofthe female reproductive organs are always situated above the hindintestine; the testi of the male lie under and ventral to it. The Larvae On account of the difficulty in getting material of the westernspecies, the following discussion is based on Gnathotrichus materiariusFitch only. 68 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 -co- KD. 7-v e \ rQJn^QJ j-*- / XD O rOJ, TO-; rCD-| r-^-i r^ rOJ^, TO, rTD,
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