126 MORPHOLOGY, ETC., OF THE MICROPTERYGIDjE, i., 



In text-fig.12, I show these two types. The jugal lobe of 

 Sabatinca and of Micropteryx is, as I have already described it, 

 small, bent under the wing in a unique position, and able to 

 engage the bristles of the frenulum, for which it acts as a primi- 

 tive retinaculum (Text-fig.12, b). Further, there is an extensive 

 patch of short, stiff spines, a specialisation from the macrotrichia 

 of vein 3A, arranged in such a position as to aid in the retention 

 of the frenulum. These were not figured in my former paper. 



Text-fig.12. 

 Jugal lobes of Micropterygidw, a, from Mncmonica mibpurptirella Haw., 

 with elongated patch of short, stiff spines placed well distad from it: 

 b, from Sabatinca incongruella Walk., with patch of similar spines 

 placed just distad from it; c, from Mnemrchea hamadelpha Meyr., 

 without any spiniferous area. (Drawn from cleared mounts, viewed 

 from beneath, all three equally enlarged, x 54). 



In Mnemonica and Eriocrania (Text-fig. 12, a), the jugal lobe 

 is much larger, and does not pass under the forewing, but pro- 

 jects from it in the same manner as in Bhyacophila. It passes 

 above the costal portion of the hindwing (in the position of 

 flight), and thus helps in the coupling of the two wings. Beyond 

 the jugal lobe, upon the distal part of vein 3 A, there is developed 

 an area of short, stiff spines, which probably also help in coupling 

 the wings, by catching the bristles of the frenulum, though my 

 material is not sufficient to decide this point for certain. 



In Mnesarchcea (Text-fig.12, c), the jugal lobe is very weakly 

 formed, but is of the same type as in Sabatinca and Micropteryx. 

 There is no area of short, stiff spines, and the frenulum is also 

 very weakly formed. 



