134 MOKPHOLOGY, EtC, OF THE MlCftOPTBRYGIDiE, 1., 



(2) Family Eriocraniidce: — Wings more normally .shaped, less pointed and 



symmetrical; costal area of forewing not enlarged, and not crossed 

 by an oblique branch of Sc near its middle. Original dichotomous 

 blanching of Rs usually lost (sometimes preserved in Mnctnoiiica). 

 Scales closely resembling those of (1). Jugal lobe large, projecting 

 outwards from forewing, so as to overlap the costaof the hind from 



above; a patch of short, stiff spines placed well distad from it 



(Genera Eriocrania, Mnemonicq, Neopseustis). 



(3) Family Mnesarchceidce : — Wings sharply pointed and symmetrical as in 



(1), but without any very definite enlargement of the costal area of 

 the forewing, and with no branch of Sc in either wing. Original 

 dichotomous branching of Rs lost, and one of the original four 

 blanches of this sector absent from both wings. Scales very highly 

 specialised, with the distal border scalloped; cross-striolation, pig- 

 ment granules, and coarsened longitudinal striae, all present. Jugal 

 lobe and frenulum both much reduced in size, the former turned 

 under the forewing, as in (1) (Genus Mnesarchcea). 



In defining the Division Jugo-frknata of the Suborder Homo- 

 XEUUAof the Lkpidoptera (9, p. 315), I gave the following char- 

 acters : — 



" With archaic jugo-frenate coupling-apparatus consisting of 

 jugal lobe, humeral lobe and frenulum; the jugal lobe turned under 

 the forewing. and acting as a retinaculum for the frenulum." 



This definition will only apply strictly to the family Micro- 

 pterygidce (s.str.), since we now see that, in Mnesarchcea, the 

 jugal lobe and frenulum are so reduced as to be only doubtfully 

 functional, while in the Eriocraniido' the jugal lobe is not turned 

 under the forewing, and does not engage the frenulum. I there- 

 fore suggest an emendation of the definition, by the omission of 

 the second portion of the statement. The definition of the 

 Jugo-frenata will then read : — 



" With archaic jugo-frenate. coupling apparatus consisting of 

 jugal lobe, humeral lobe and frenulum."' 



This definition will hold for the whole group Micropterygidce 

 (sens. lat. ), in whatever Order it may be finally determined that 

 they should he placed. 



