Dr. Philippi on the Hersilia apodiformis. 301 



The female, without the tail bristles, is §rds of a line long, 

 and oval; the male not quite half so long, and narrower. 

 The body was quite covered by a quadriarticulated shield; 

 the first segment occupies nearly the half of its length, the 

 last a fourth, the second and third each an eighth part ; the 

 first three segments have a point on each side at the end. 

 On the first segment I saw in front two round points at a 

 moderate distance from each other, which I am inclined to 

 take for eyes. Under the shield anteriorly only the two 

 great antennae appear, posteriorly the tail and the extre- 

 mities of the posterior legs. The antennae are only two 

 in number, inserted beneath the shield, near to the anterior 

 margin. They attain to half the length of the body, and ap- 

 pear to consist of five articulations. The basal joint is very 

 short, concealed beneath the shield; the second articulation 

 is longest of all, then the fifth ; the fourth is the shortest 

 after the first. Perhaps the fifth consists of several arti- 

 culations : I was however unable to assure myself of this. 

 Anteriorly all these joints are ciliated with long stiff bristles, 

 posteriorly there is only one bristle at the end of every joint. 

 There are four pairs of distinct feet ; one to each segment of 

 the shield. The three first pairs are quite similarly formed, 

 and consist of a biarticulated stalk, which bears two ramifica- 

 tions. The stalk has posteriorly a long bristle on the first 

 joint, a shorter one on the front end of the second. The front 

 ramification consists of three articulations, of which the third 

 is as long as the two first together ; it has upon its anterior 

 side three strong bristles, and posteriorly five longer but weaker 

 ones, whilst the two first articulations have only a short bristle 

 at the anterior end. The hinder ramification is just as long 

 and has also three articulations, but these are alike and densely 

 beset with cilia on the posterior side. The fourth pair is 

 simple, biarticulated ; the first articulation is very short, the 

 second rather long and armed with four bristles. The tail is 

 about the third part of the whole length of the animal, but 

 only half of it projects from beneath the shield. It is not di- 

 stinctly articulated, tapering towards the end, and terminates 

 in two obtuse small projections, each of which bears five long 

 bristles. The inner bristles are the longest, in the male more 

 than half as long as the body, in the female considerable* 



