Nov., '07] 



ENTOMOLOGICAL NEWS. 



387 



the aquatic forms described by Muller, in Brazil,* and by Kel- 

 logg, in California.f It differs, however, in some essential 

 respects from Miall and Walker's larva, especially in the char- 

 acter of the last segment. 



The body is pale yellowish or whitish, 4.5 mm. in length, the greatest 

 width being .5 mm., cylindrical, and consisting of a head followed by 

 eleven segments. Transverse constrictions subdivide the segments, the 

 first four behind the head consisting of two annuli, the following six 

 segments each having three. The last segment is undivided. Minute 

 and densely crowded chitimous tubercles cover the body in all parts not 

 wholly chitinized, and over the entire body are fine setae, somewhat 

 more scattered but often occurring in rows. On the dorsal surface of 

 the ninth and tenth segments are six chitinous shields or plates, one to 

 each annulus. These plates are heavily chitinized but otherwise are 

 very simple. 

 The head is small and strongly chitinized. Minute antennae consist- 

 ing of a group of several short rods 

 project from the anterior portion, and 

 on each lateral aspect is a pair of 

 setae, the anterior seta usually larger 

 than the posterior one. Nothing re- 

 sembling ocelli or eye-spots is ap- 

 parent. 



The mouth parts closely resemble 

 those described in Miall & Walker's 

 account and consist of jointed or flap- 

 like appendages, all more or less 

 setose or provided with denticulated 

 chitinous plates, and contained in a 

 sunken part of the ventral surface of 

 the head. When the larva is feed- 

 ing, the movable upper lip, with the 

 long, jointed, setose appendage next 

 it. is extended and retracted in rapid 

 «s»' _ _ succession, and , the larva probably 



thus provides itself with a continual 

 supply of food. 



The last segment of the body, thick 

 at the base where it is formed into a 

 well rounded stump ventrally, nar- 

 rows toward the apex, forming a re- 

 spiratory tube. The anal opening oc- 

 curs on the rounded ventral surface, 

 which has remained unchitinized. The 



c=» - 



a, dorsal. 



b, ventral. 



* Tr. Ent. Soc. Lond. p. 479, 1895. 

 t Ent. News, xii, p. 46, 1901. 



