Vol. XXvi] ENTOMOLOGICAL NEWS. 303 



on the mid-dorsum at about three-fifths of the segment's length ; on 2 

 to 5 this row is represented by two separated patches of setae, one on 

 each side of the mid-dorsal line and at the same part of each segment's 

 length; on the dorsum of 6 to 10 are also similar setae but apparently. 

 in most specimens, not as regularly arranged as on I to 5 ; in addition 

 to the setae i to 10 bear longer, softer hairs. Hind dorsal margin of 10 

 with a wide shallow median emargination. Grooves separating the 

 sternites of I to 9 from the inflexed ventral parts of the tergites more 

 distinct in the exuviae than on the larvae, in some of which latter they 

 are very slightly marked. 



Caudal "gills" three, evidently much subject to injury and regenera- 

 tion, when fully developed each two-jointed, the first joint thicker and 

 higher than the second; median or mid-dorsal gill (PI. XI, figs. 9, gd, 

 t)v) with a mid-dorsal and a mid-ventral longitudinal carina on the 

 first joint, the mid-dorsal carina being more convex and armed with 

 shorter, stouter spines, while the mid-ventral carina is less convex and 

 bears longer, more slender hairs. Each lateral gill (PI. XI, fig. 7) 

 with two longitudinal carinae on the mesal surface of the first joint, 

 one of which is dorsal the other ventral ; between these two carinae is 

 thus a longitudinal trough or valley; in profile view the dorsal surface 

 is more convex than the ventral. The second joint in all three gills is 

 subcylindrical. When only one joint is present in any of these three 

 gills it is probably a case of incomplete regeneration after injury. The 

 surfaces of the three gills bear many soft hairs in addition to those on 

 the carinae but can not be described as densely hairy. 



Cercoids (superior appendages of the imago) slender, tapering, curved 

 ventrad and applied closely for their entire length to the hind surface 

 of abdominal segment 10. 



$ . Rudiments of the copulatory apparatus visible on the ventral side 

 of abdominal segment 2 in the larger larvae and in the exuviae. Gon- 

 apophyses on 9 represented in the larger larvae by two slightly ele- 

 vated subcircular areas separated from each other by about the diam- 

 eter of one of them, each bearing at its hind end i to 3 posteriorly-di- 

 rected spines. 



9. Gonapophyses of abdominal segments 8 and 9 of variable length 

 as indicated in the table on page 304. 



The larvae preserved in alcohol have the body ochre with black mark- 

 ings. 



Some of the internal organs of these larvae will be consid- 

 ered in the next number of these Studies. 



