166 Mr. R. McLachlan on new 



I have founded this genus upon a large undescribed 

 insect from China, which will not arrange itself in any 

 existing group, In the form of the quadrilateral (a 

 character which is probably eminently artificial) it ap- 

 proaches Vestalis, yet not more so than does Neiirohasis, but 

 ditf'ers in its angulate arculus, in the presence of a very 

 strongly mai'ked inferior branch of the second sector of 

 the triangle (the form and direction of which is peculiar) , 

 and in the possession of a large pterostigma. On the 

 other hand, it difi'ers from any group of De Selys* 

 "premiere cohorte." Thus, from CaJopteryx (sens. 

 strict.) it is separated by the possession of a well-formed 

 pterostigma, even in the S , and from Matrona by the 

 same character, combined with the free basal space ; from 

 Cleis, Sapho, Mnais, and Echo, it differs in its angulate 

 arculus (from EcJw also in its free basal space) , approach- 

 ing the first {Cleis) in the curved ramifications of the 

 sectors; from Fliaon and Neurohasis it is separated by 

 the form of the antennae, and presence of a pterostigma 

 (from Neurohasis also by the free basal space) . 



After a consideration of all these characters, I am in- 

 clined to place rsolodesnms near Calopteryx (sens, 

 strict.), on account of its general form, notwithstanding 

 that in the form of the quadrilateral it approaches 

 Vestalis. 



Tsolodcsmus o^iandarlnus, n. sp. 



Dark bronzy-green. Head : labrum shining black ; 

 clypeus metallic blue-green ; second joint of the antennae 

 pale yellow in front. ProtJiorax \vith the hinder margin 

 blackish. Thorax proper with the dorsal and lateral 

 sutures black ; sides metallic golden-green beneath the 

 posterior wings. Legs black, with black spines; coxae, 

 trochanters, and base of femora, beneath, yellow. Abdo- 

 men brownish-black; the first and second segments 

 bronzy-green (segments 7-10 wanting) . 



Wings similar in form and coloration; the basal half 

 (or rather more) sub-hyaline, smoky ; afterwards there 

 is a broad, oblique, semi-opaque, white band; apical 

 portion (one-fourth of the entire length) blackish brown 

 with brassy reflections ; neuration blackish ; nodus placed 

 nearer to the base than to the pterostigma; pterostigma 

 brown, surrounded by strong black veins, surmounting 



