i6 



the apex, and at rest the tips pass one another. The upper lip 

 or labrum is very broadly rounded or truncate at the apex and 

 there ciliated, and often the mandibles are largely concealed be- 

 neath it. The lower lip apically is usually strongly bent upwards 

 ar an angle with the lower surface of the head. The mouth 

 opening is large and only partially closed by the large mandibles 

 and the maxillae, which lie beneath them. There is a single- 

 jointed (faint indications of a secondary division may sometimes 

 be noticed) maxillary palp, bearing a few microscopical hairs at 

 its apex, or sometimes one more conspicuous spinose hair and 

 some shorter ones. The head is sparingly set with hairs or 

 bristles which differ with the species, and these distinctions pos- 

 sibly yield characters of generic importance. 



All the larvae known are very active and most of them crawl 

 about quickly on their emergence from the sac, in search of a 

 proper place for spinning their cocoons. Some however like 

 Neodryinns pupate on, or close to, the spot at which they issue 

 from the host. They show many differences in colour, according 

 to the species, the majority being white or pinkish. Some how- 

 ever are brown and others light green. It is noteworthy that a 

 light green larva may issue from the sac on a brown coloured 

 Jassid, while another species from a light green Jassid may not 

 be green at all. These colour distinctions are, I believe, constant 

 for a species. 



COCOONS OF DRYINIDAE. 



The larvae of all the known species spin a compact silken 

 cocoon, which often consists of two parts, an inner adapted to 

 the form of the larva and an outer and wider covering. The spe- 

 cies of Neodryinns further elaborate this by fixing over it a roof, 

 formed of the greater part of the larval sac. Many of the cocoons 

 are highly characteristic of the genus or species, and though in 

 some the details of shape, etc., are not absolutely constant, yet in 

 many cases the species can be immediately distinguished by an 

 examination of the cocoons, provided that these are formed on 

 similar substances. When found on very different surfaces there 

 may naturally be considerable difference exhibited by cocoons 

 even of one species. The cocoon of Paradryinus is elongate anrl 

 cylindrical and often found on the surface of green leaves. Un- 

 der these conditions the cocoon of P. threnodes is densely stud- 

 ded with round patches of epidermis stripped off from the leaf 

 surface; that of P. koebelei is less denselv covered, with more 



