8 



[January, 



Details of Telmatoscopus rothschildii. 



The acale of enlargement of the wing is showai by the proportional 

 enlargement of '25 mm., and that of all the other details by the enlargement 

 of •! ram. {25 mm. = '01 inch). 



1. Wing of male denvided. C, costa ; S.c, subcosta ; E\. radius, and E= 



to R ^ its bx-anches, 

 the radial sectors, 

 of which E,- and 

 R^ constittxte the 

 sectorial fork ; M ^ 

 and M", branches , 

 of the median vein, 

 the partition vein 

 of the two basal 

 cells, forming the 

 median fork ; Cu ' 

 and Cu", cubital 

 veins, enclosing in 

 this instance a 

 sessile cubital 

 fork ; A, anal 

 vein. 



AG E.icl^ 



Details of Telmatoscopus rothschildii 



2. Joints 1 to 4 ; and 2a, joints 3 and 4, in ^ antenna;, partly demxded, 

 showing " articular appendages." 



3. (? Inferior genital appendage and its segmental base, denuded, viewed 

 from the side ; and 3a, part of the other, showing the tenaculfe from another 

 stand-point. 



4. S Broad-side of a sixperior genital appendage or gonopod, partly denxxded. 



5. ? Five basal joints -, and oa, the last three joiixts of axx axxtenna denuded 

 of hair, these last with inconspicxxous articxxlar appeixdages. 



G. 9 Subgenital lobe. 



This species is traceable to the section of the genus Telmatoscopus 

 containing the two forms referred to above, by the following chain of 

 characteristics : — anterior basal cell delimited in front by the sectorial 

 division of the radial trunk alone; most of the joints of the flagellum 

 in ^ antennae narrowed ajiically into a beak or neck ; base of the 

 pedicel of the sectorial fork free, or else linked by a cross-vein to the 

 basal cell ; nodosities of the last few joints in the flagellmn spaced by 

 beaks or necks ; inferior J genital appendages pluri-tenaculate ; third 

 joint in ^ antennae similar and equal in length to the fourth, even if 

 shorter necked. 



Tlie secitio is characterized by : — wings lanceolate, apically acute 



