Fammty—POLYCTENIDA. 199 
data inserta, fiz. G); prothorace fere rotundato ; dorsi margine postico serie transversa spinarum armato ; pedibus 
brevioribus et crassioribus ; abdomine pone medium paullo dilatatum; elytris(?) in mare(?) magis rotundatis 
quam in individuo stylum apicalem gerente. 
Long. corp. fere lin. 2. 
Habitat parasitice in Wolosswm Chinensem (Giglioli). 
Plate XXXIX, fig. B, Polyctenes Molossus male (?). 
Fig. B* represents the head seen from beneath, shewing the lunate clypeus (?) the double curved row of spines 
in front of the proboscis, the two antenni, and the two trabecul, the lower row of spines of which is bent inwards 
towards the proboscis; the three-jointed proboscis, shewing an oval portion at the base, which seems to repre- 
sent the labrum and two of the elongated internal sete. Also the transverse row of spines along the posterior 
margin of the head, with two strong: spines at the outer angle. 
Fig. A, one of the thick fore legs, in which the tarsal joints appear soldered together, probably owing to 
the dilatation of the outer covering by the growth of the inclosed limb. Fig. B exhibits the tarsus of one of 
the fore lees, and fig. C the extremity of the tarsus of the other fore leg: in both figures are to be seen, within 
the terminal joint, the ungues of an inclosed tarsus, shewing that the specimen was about to cast its skin1, and con- 
sequently proving that the species undergoes the metamorphosis dimidiata, with either a complete or semicom- 
plete pupa. 
Fig. D represents one of the four posterior tarsi, shewing the pulvillus as well as the ungues of a different 
form to those of the fore leg, one being simple and slightly bent, whilst the other is very deeply notched. 
Fig. E represents the extremity of the same tarsus, shewing the ungues and pulvillus of the inclosed limb. 
Fig. F shews one of the spines of the lateral margin of the clypeus, with the cup-like tubercle in which it 
is inserted. 
Fig. G, the cup of one of the flattened spines (fig. H) of the anterior margin of the trabecula. 
Plate XXXIX, fig. A, represents the other sex, having a larger body and a curved horny appendage at its 
extremity beneath. 
Plate XL, fig. A, represents the under side of the head and prothorax, with the fore legs (the apical half of 
the tibie and tarsi cut off). In this figure the transverse row of comb-like spines (29 in number on the pos- 
terior margin of the head), and the similar row with 49 spines, are represented, having been rendered visible by 
the treatment with Canada balsam in which the specimen was immersed. The delicate transverse striature of 
the clypeus, the partial withdrawal of one of the set of the mouth from the proboscis at *, as well as that of 
three of the sets from the longitudinal opening of the proboscis towards its apex, and the two strong pairs of 
muscles for the movement of the fore leg, are shewn. In this sex (as seen also in pl. XX XVIII, fig. 4) the 
lower row of spines of the trabeculz is not developed into a comb as in the opposite sex. 
Fig. D shews the anterior tibia and tarsus, the triarticulation of the latter being more distinctly shewn than 
in the other specimen. 
Fig. E, one of the four posterior tarsi, shewing the lobed base extending to the tip of the first joint. 
Fig. C, three of the spines of the upper margin of the trabecula. 
Fig. B, the extremity of the body seen beneath, shewing a transverse oval lobe with two setose pupilla and 
the strong curved horny appendage (ovipositor ?). 
* The question here naturally arises whether, upon the next shedding of the skin, indicated by the already perfect 
state of the distal extremities of the inclosed limbs, the dorsal scales resembling elytra would be further developed either 
into elytra or hemelytra ? 
