. Bulletin - New York State Museum. Science. 494 NEW YORK STATE MUSEUM at apex, strongly expanded at the base and extending beyond the Megarhinus portoricensis Von Roder. Genitalia, male. Basal clasp segment stout, subtriangular, tapering to a narrowly rounded apex Terminal segment rather slender, base slightly enlarged, tip slender bearing a rather long, acute terminal spme. Claspette represented by a simple, broadly rounded basal setaceous lobe. Harpes long, excavated externally and terminated by a stout, chitinous spine and a series of minute denticulations. Harpa- ^ones slender, closely ap
. Bulletin - New York State Museum. Science. 494 NEW YORK STATE MUSEUM at apex, strongly expanded at the base and extending beyond the Megarhinus portoricensis Von Roder. Genitalia, male. Basal clasp segment stout, subtriangular, tapering to a narrowly rounded apex Terminal segment rather slender, base slightly enlarged, tip slender bearing a rather long, acute terminal spme. Claspette represented by a simple, broadly rounded basal setaceous lobe. Harpes long, excavated externally and terminated by a stout, chitinous spine and a series of minute denticulations. Harpa- ^ones slender, closely appressed, ventral edge with a series ot minute teeth. Unci fused, slender, ending m acute points. Set- aceous lobes moderatelv well developed, thin, bearing numerous loner rather slender setaceous spines. Seventh segment with a traSsverse row of verv long slender spines across the posterior third, evidently a generalised type of the submedian groups of spines observed in some other genera. [PI. 19. fig- A The Corethrinae are a fairly homogeneous subfamily, despite the wide differences in larval structures, though there is a substantial acrreement in habits, all being aquatic and predaceous. Core- ^ thrella appears to be the more generalized of the various genera, there be- ing comparatively slight differences between the antennae in the two sexes [fig. 2]. Those of the female are remarkable because of the rudimentary whorl of hairs near the middle of each segment, and those of the male are unique on ac- count of the long, fine hairs continued to the apical fourth. The wings of both sexes are substantially alike, both possessing the obli- que scales along the mar- gin, a character almost uni- versally limited to the female. The claws are sim- ple in both sexes, though Fig "ao C o r e t h r e 11 a b r a k e 1 e y i , dorsal view -^hose of the forC-aud mid- of larva showing the pecuhar head struc- 1 â ^ ^ turea and the paired separate spiracles of Ipp-S of the male aTC the ai
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
