1914.] 149 



Denticulation of saw coarser (at least Denticulation of saw finer (if inor- 



it appears so in some of Cameron's nata, C, belongs to this sp.) 



figures, but I do not know how 

 far these can be relied upon.) 



Interstitial 2nd recurrent n. (but an 2nd recurrent n. not interstitial (but 



semper?). an semper?). In a specimen 



named dorsalis by Konow it is 

 decidedly interstitial ! 



Posterior calcaria as long as half the Posterior calcaria not so long as half 



metatarsus. the metatarsus. 



Mesopleur* hardly ever pale. Mesopleurse pale. 



Various authors are responsible for the above characters, and as these took 

 different views of the limits of the species distinguished it is difficult to fit them 

 into a single diagnosis ! Some of them, I feel sure, are unreliable ; and it may 

 be doubted if others are sufficiently definite for practical purposes. 



I will now try to separate the forms known to me, but must leave it to be 

 decided hereafter how they are to be divided into species. 



(a) Large pale yellow $ ? which, but for their simple hypopygium, 



might be thought to belong to litterata. Copious pictura 

 albida, and a minimum of black markings. 2nd recurrent n. 

 interstitial in all my own specimens. Spurs measure exactly 

 half the metatarsus. Vertex not very transverse, and evidently 

 sulcate completely down the middle... 



Typical nassata, L., sec. Enslin (= nassata, Knw.). 



(b) Considerably smaller than typical nassata, as are likewise all 



following. May be known by the absence of pale colour 

 the back of the abdomen, which is practically black all c 

 (I have seen few British specimens.)... 



lividiventris, Cam. (at S. Kensington; 

 = "tilise var. sagmaria," Knw. (determined ab ipso !). 



(c) Back of abdomen with a broad black central vitta, but pale 



laterally albomaculata, Cam. (at S. Kensington) 



= tilise var. vittata, Knw. {det. ab ipso !). 



(d) Like the last, but the vitta is narrower, nearly linear. Pleurae 



pale tilise var. dorsata, Knw. {det. ab ipso!). 



(e) Like the last, but the metapleurie are black... 



dorsivittata, Cam. (determined by Knw. !). 



(/) The vitta on the abdomen has disappeared altogether... 



tilise var. inornata, Knw. (det. ab ipso). 

 This is certainly not the inornata of Cameron ! 

 (g) Exceedingly like (d). In fact I can see no tangible difference... 

 " dorsalis, Lep.," determined for me by Konow. 



