6 SECOND YARKAND MISSION. 



ferior appendages long and stout, slightly curved, directed upward, yellow with concolorous 

 hairs ; at the apex is a dense brush of spiniform yellow hairs, perhaps concealing a smaller 

 apical joint ; from without this brush projects a flattened obtuse process, perhaps connected 

 with the appendage, or perhaps distinct from it, and for its greater length lying in its 

 concave inner side. Penis placed far internally, slender, slightly geniculate, yellow. 



In the ? the neuration and palpi are regular, and in details almost precisely as in 

 D. pugnax (vide my Revision and Synopsis of the Trichoptera of the European Fauna). 



Length of body 5J 6 mm. Length of basal joint of antennae 3 mm. Expanse 

 18 21 mm. 



The genus Dinarthrum was established by me in the Journal of the Linnaan Society, 

 Zoology, vol. xi, p. 116 (1871), for an insect from North India described as D.ferox, in 

 which the extraordinary basal joint of the antennae of the $ has a very strong basal tooth. 

 Later on, in 1875, I described another species in the Neuroptera of Eedtschenko's Travels in 

 Turkestan, page 30 (and more recently in Part V of my Monographic Revision and Synopsis of 

 the Trichoptera of the European Fauna, page 279, pi. xxx, 1877), as D. pugnax, in which the 

 said joint has two such teeth. In D. inerme there is no tooth. All the species bear consider- 

 able external resemblance one to the other, and are only separable by structural characters. 

 The form is very curious, and as is usual in this section of Sericostomatidce, the sexes differ 

 greatlyin appearance and structure : the nearest ally amongst true European insects is the 

 genus Lasiocephala. 



SUMMARY. 



Only about 15 species of Neuroptera (in the broad sense) have been seen by me, viz., 

 four species of Odonata (dragon-flies), one of Ephemerida, three of Perlida, one of 

 MyrmeleonidcB, three of Chrysopidte, and three of Trichoptera. 



The general aspect is European. All the Odonata are European, and two of them 

 occur in Britain. The ant-lion (Myrmeccelurus) is a species of Eastern Europe. The 

 Chrysopidce have nothing peculiar about them. The genus Dinarthrum in the Trichoptera 

 was orginally founded on an Indian species, but I have since seen another species from 

 Turkestan, so that the genus should probably be regarded as more Central Asian than Indian. 



