i.] 119 



alula and the posterior fringe, and again very sparingly at the extreme 

 bases of the costa and axillar nervures, are lanceolate or linear scales, 

 succeeded for only a very short distance by flattened hairs ; these are 

 followed by ordinary hair. Type, Ps. phalcBnoides, L. . . 



Psychoda, Section I. 



b. Bristling hair wanting on the prsebrachial, posterior pobrachial, and 

 anal nervures ; its endings on the others lie in the circumference 

 of a slightly truncate, semi-ellipsoidal curve, approximate to the 

 wing-margin, and with the ending on the cubitus directly opposite 

 that on the anterior pobrachial, considerably beyond that on the 

 postical. 



t Inferior $ genital appendages distinctly longer than their basis, and 

 uni-tenaculate ; tenaculum relatively short... 



Species Nos. 2 — 4, Brit. 



ft The same appendages subequal in length to their basis, short and 

 stout, tri-tenaculate in the British species, but uni-tenaculate 

 in the Algerian ; tenaculse relatively long... 



Species No. 1, Brit. ; XVI, Alg. 



hh. Bristling hair wanting on the posterior radius, prsebrachial, posterior 

 pobrachial, and anal nervui-es ; its endings on the cubitus and 

 anterior pobrachial distant from the margin, but on the other 

 nervures adjacent thereto ; those on the cubitus and postical 

 directly opposite each other, and a little beyond the ending on 

 the anterior pobrachial nervure. Inferior S genital appendages 

 very little longer than their basis, slender and uni-tenaculate ; 

 the tenaculum hardly one-fourth the length of the appendage... 



Species No. 5, Brit. 



B.B. Bristling hair wanting on the subcosta. Dorsal hair bristling on only the 

 first abdominal segment, smooth on the remainder. External ? geni- 

 talia valvular, short and obtuse, somewhat as in Sycorax. Beneath 

 the wing-base in the S , on the nervures bounding the anterior basal 

 cell, and at the extreme base of the mediastinal nervure, are rather 

 short, obovate, appressed scales ; the other nervures thereabouts are 

 clad either with flattened hairs, or with linear or acicular scales. 

 Type, Ps. humeralis (Hoffmgg., MS.), M-eig.... Psychoda, Section II. 



J? Bristling hair also wanting on both branches of the radius, on the prse- 

 brachial, posterior pobrachial, and on the anal nervures ; its 

 ending on the radius conterminous with the stem, subopposite 

 that on the cubitus, both distant from the wing-margin and far 

 interior to its ending on the anterior pobrachial ; this last is 

 farther from the margin than the endings on the postical and 

 axillar nervures, which approach nearer and nearer thereto. In- 

 ferior (J genital appendages subequal in length to their basis, 

 stout and bi-tenaculate ; the tenaculse slender and relatively 

 long Species, No. 6, Brit. 



