116 



MORPHOLOGY, ETC., OF THE MICROPTERYGIDiE, 1., 



maimer of flight, and strictly comparable with the similar special- 

 isation to be seen in the wings of the PsycJiodidte, amongst the 

 Diptera. The broadened costal area of Micropteryx, with the 

 oblique branch developed from Sc, is to be regarded as correlated 

 with this specialisation rather than as an archaic feature of the 

 wing; it should be noted that both are absent from the narrower 

 hind wing. 



There is, then, no difficulty in recognising the same type of 

 venation in Micropteryx and in Eriocrania; though, if we did 

 not possess the tracheation of the latter to guide us, we might 

 indeed find it difficult to recognise the true courses of the cubitus 

 and anal veins in the hindwing of this genus. 



Text-fig. 7. 

 Wings of Sahatinrit incongruella Walk. ( x 18). pa, posterior arculus; 

 R 1? in hindwing, the obsolescent portion of the main vein R x j Sca+Rj, 

 in hindwing, the fused distal ends of Sc and R^ Sc,, oblique branch 

 of Sc crossing enlarged costal area of forewing. 



Passing from Micropteryx to the closely allied Sabatiiica (Text- 

 fig.7), we find a very similar type of wing, both in shape and 

 venation. The costal area of the forewing is enlarged, as in 

 Micropteryx, and carries not only the extra branch from Sc, but 

 also the archaic humeral cross-vein. A remarkable feature of 

 this wing is the strong distal fork of Rj, comparable with that 



