THE CANADIAN ENTOMOLOGIST. 115 



is provided with six to eight short lobes arranged in a circle. The 



appearance of the whole egg is much like that of a minute Grantia 



sponge. 



Dufour described the eggs of striata and hieroglyphica as acuminate 

 at the free end and placed on a pad. White speaks of the eggs he 

 describes as pyriform and attached at the broader end. He does not 

 mention the pad or cup, nor does Heidemann,' of Corixa mercenaria. 

 It would be of interest to discover if there is a difference in this regard 

 between different species of Corixids or whether in some cases the pad or 

 cup has merely escaped observation. 



First Instar. 



Length about 1.15 mm. Width about .55 mm. General ap- 

 pearance of adult, but wider in proportion to length. (Fig. 2.) 

 Head about three times as wide as long (dorsal aspect); distance fron> 

 vertex to tip of beak about equal to the width between eyes (ventral 

 aspect). Eyes prominent and conspicuous, deeply pigmented, facets 

 relatively large. The beak is apparently four-jointed, rather broad 

 and conical. The black tips of the mandibles and maxill?e project 

 slightly between the two halves. The former are somewhat shorter 

 than the latter, curved, with minute serrations at the tips, and may 

 be seen to extend into the head apparently up to the level of 

 the eyes. 



The antennae are two-jointed, inserted far down toward the 

 beak, the last joint about Yi the interorbital width in length. Tarsi 

 all one-jointed. Those of first leg when at rest, curved over beak as 

 in imago. First tarsi triangular in section, about ^ as long as those 

 of third leg, 3^ times as long as broad, oblong-triangular, broadly 

 rounded above, the comb of bristles prominent. (Fig. 2a.) Tibia 

 of second leg 3/5 the length of tarsus and squarish in section with 

 the anterior angles armed each with a row of short bristles. Inter- 

 mediate tarsus nearly 8 times as^ long as broad, with a ventral row of 

 long bristles and several rows of much shorter ones ; tarsal claws 

 weak, variable in length. Third leg sparsely bristled, tarsal joint 

 slightly longer than the tibia or the femur, which are subequaL 

 Body a little less than twice as long as broad, the posterior angles 

 not so truncate as in later instars, provided and armed each with a 

 half dozen rather long bristles. Lateral margin of body with bristles 

 on posterior half only. 



7. Proc. Ent. Soc, Wash., XIII, 191 1, p. 140, PI. XII, fig. 7. 



