346 



agreeing on the whole with those of the mother, but the head 

 appears proportionately longer. The anterior section (La) of 

 the head is generally described as the clipeus, but we are 

 now convinced that it really corresponds to the upper lip (labrnm) 

 of the bed-bug. This labrum appears decidedly longer than 

 in the adult, but that may be due to the sides being bent down. 

 The upperside of the head bears in the embryo and the imago 

 two oblique rows of bristles converging posteriorly, and an 

 apical comb of spines. The right-side portion of the head of 

 the dried-up embryo is much curved down, which accounts for 

 the position of the corresponding portion of the nuchal comb in 

 our figure. The number of spines in this comb (Ct. nu.) is the 

 same as in the imago (48). 



The proboscis stretches forward, and consists of three seg- 

 ments, as in the adult examples of this species, the apical segment 

 being much the longest. The antennae (Ant) also are directed 

 forward with the exception of the first segment, which has the 

 same position as in the adult, being directed laterad. The 

 armature of the first antennal segment differs markedly from 

 that of the adult. This segment has in the imago a subapical 

 transverse row of spines, a longitudinal row of smaller spines 

 near the anterior edge, and a row of curved bristles at this edge. 

 These bristles are present in the embryo, but the longitudinal 

 comb is entirely absent, and the subapical one is only represented 

 by a single spine. 



The two half-rings of the guiar comb (Ct. gu) are very dis- 

 tinct, each consisting of eighteen spines, as compared with nine- 

 teen or twenty in the nymph, and twenty-two in the imago. 



The prothorax and the elytra — which both have an apical 

 comb in the imago — are so much obscured that I cannot make 

 out their outlines, but so much seems certain that they do not 

 bear combs in the embryo, as these would show at one place 

 or another on the slide. 



The claws of the tarsi are as strongly chitinised as the spines 

 of the combs, and therefore stand out fairly clearly. 



In No7). Zool., 18, t. 13 (1911), we figured an immature 

 example which we consider to be the nymph of Eoctenes nyderidis. 

 The specimen differs from the adult — apart from the bi-articulate 

 mid- and hindtarsi and some other larval characteristics — 



