LIFE-HISTORY OE CEOCE EILIPENNIS. 155 



except through the partial transparency of the mandibles. There are no maxillary palpi. 

 The labium is fused up with the ventral region of the head ; a pair of prominent labial 

 palpi are present (l.p. in fig. 4). The palpi are three-jointed, the terminal joint being 

 the longest. The joints are related to one another in length as 5 : 3 : 11. 



The neck consists of two segments, and is a little longer, though much narrower, than 

 the head. The first segment carries no appendages, but the second segment bears the 

 first pair of legs, and is consequently to be regarded as the prothorax. The first division 

 of the neck is the shorter and narrower of the two and its diameter lessens posteriorly. 

 The second division of the neck broadens posteriorly and, in addition to its shape and 

 slightly larger size, it differs from the first segment in its antero-lateral angles being 

 more prominently rounded. 



The trunk is a region of composite nature. It carries the second and third pairs of 

 legs, and consists of the meso- and metathorax imperfectly demarcated from the abdomen. 

 The indications of segmentation are a little indistinct, but the abdomen appears to be 

 composed of ten segments. The legs are long and slender, subequal in length. The 

 coxa and trochanter are short ; the femur, tibia, and tarsus are related respectively to 

 one another in length as 10 : 11 : 6. The tarsus is terminated by a pair of slender 

 curved claws. 



Over the dorsal surface of the body of the larva are distributed curious cuticular 

 structures, each borne on a small chitinous tubercle with which it is articulated. There 

 are two types of these structures, one of which is small and lanceolate with entire 

 margins, and the other larger and dentate. I propose to distinguish them as the lanceo- 

 late and dentate spines (PI. 32. fig. 5). The lanceolate spines are the less common type 

 of the two, and are found on the outer border of the mandibles and on the legs. Those 

 on the tarsi and the apices of the tibise are slightly longer than the spines that occur 

 higher up. The two distal teeth of the mandibles each carry laterally a lanceolate spine, 

 and the two proximal teeth each bear a dentate spine. A number of dentate spines are 

 scattered over the dorsal surface of the head, and a row of five specially prominent 

 spines occurs around the base of each mandible. The first segment of the neck carries 

 a double longitudinal row of dentate spines on each side — a dorsal row of three (or 

 four) spines and a dorso-lateral row of three. The second neck-segment bears a pair of 

 dentate spines on its anterior margin — an antero-lateral pair, and a longitudinal dorsal 

 row of six spines on either side of the middle line. In the trunk-region the dentate 

 spines are principally arranged in transverse rows and are most numerous posteriorly. 



B. The half-grown Larva. — The half-grown larva differs from the newly hatched 

 larva, not only in its much greater size, but also in the body being much flatter and less 

 convex, in the greater chitinization of the cuticle, in being pigmented, and in the 

 relatively larger size of the trunk-region. 



The head is similar in shape to that of the newly hatched larva, but the mandibles 

 differ in having usually nine tooth-like projections along their inner edges instead of 

 four. They are not to be regarded functionally as teeth, for they carry articulated 

 spines, and, moreover, the manner in which the larva seizes its prey by the tips of its 

 jaws, and the fact that it feeds on the juices of its prey by means of suction, precludes 



