Eu 
Fam. PopuvRIDx. 
Abdomen segmentis ad summum 
septem ; propodii tubo infero 
medio exserto. 
Segmenta abdominis anteriora 
(propodio dempto) mutica. 
Segmentum extremum appendice 
inflexa laciniis binis setaceis 
terminata (furca saltatoria); 
vel his brevissimis conicis re- 
trorsum versis. 
Vasa Malpighiana nulla*. 
Proventriculus obsoletus. 
MR. A. H. HALIDAY ON IAPYX, 
Fam. IAPYGIDÆ. 
Abdomen segmentis 10 (compu- 
tato propodio). 
(Segmenta abdominis anteriora 
 appendiculata vel mutica.) 
Segmentum extremum appendi- 
cibus porrectis binis tantum 
(diversimodo formatis). 
Vasa Malpighiana nulla. 
Proventriculus obsoletus. 
446 
Fam. LEPISMIDJE. 
Abdomen segmentis 10 (compu- 
tato propodio). 
Segmenta anteriora abdominis 
utrinque appendiculata (non- 
nulla saltem). 
Segmentum extremum appendici- 
bus porrectis pluriarticulatis, 
ternis (vel pluribus numero 
impari). 
Vasa Malpighiana 4. 
Proventriculus triturationi aptus. 
DESCRIPTION OF THE PLATE. 
PLATE XLIV. 
Lapyx solifugus. 
A. Natural length of a mature specimen. 
B. Magnified figure of one, from above. 
C. Last three segments, from beneath. 
D. One arm of forceps. 
E. Anterior outline of head from beneath, with the palpi (labial) in position. 
F. First joint of both antennz with their insertion. 
G. Base of antennze, first five joints. 
H. An intermediate joint. 
I. "Terminal three joints. 
K. Three intermediate joints, from a young specimen. 
L. Fore leg. 
M. Under side of mesothorax (sternum, 4), with one leg complete. 
N. Middle leg. 
O. A claw. 
1. The mouth, from beneath, with the maxillze open. 
2. Anterior portion of labium, more magnified : p, palpus; g,exteriorlobe, or paraglossa; mM, n, divisions 
of one of the intermediate lobes; 7, hypopharynx? 
3. Paraglossa, and an intermediate lobe, alone. 
4. The same, with palpus in position. 
5, 6, 7. Mandible, seen in different aspects. 
* Six, according to Burmeister and Nicolet ; but I have failed to find them. Still I should have followed their 
authority here without doubting, but that Mr. Lubbock’s minute and careful investigations have not succeeded ™ 
bringing these 5 gans to light (see Trans. Linn. Soc. vol. xxiii. p. 441). A 
