106 



J. W. S. MACFIE AND A. INGRAM. 



were unable to detect in the larvae any constant difference of specific importance, 

 and as tliis observation is in accord with that of Edwards further details will not 

 be given. 



In a previous paper (Bull. Ent. Res. viii, p. 85) we have described the pupa of 

 C. invidiosus. The pupa of G. decens {= C. nigrocostalis, Theo., and C. lividocostalis, 

 Graham) has been briefly described by Wesche (Bull. Ent. Ees. i, pp. 40 and 45), 

 but the details given are meagre. As it was necessary on this account to re-describe 

 the pupa of C. decens, and as it seemed advisable to give at the same time further 

 details regarding C, invidiosus because of the very close resemblance of the two 

 pupae, we decided to compare seta by seta five specimens of each. The result of 

 this examination will be recorded here in detail. 



The pupae were found to be similar both in their general features and as regards 

 the arrangement of their cephalo-thoracic and abdominal setae. In describing 

 the setae the same method has been adopted as that employed by one of us in des- 

 cribing the pupa of Stegomyia fasciata (Bull. Ent. Res. x, pp. 161-172). 



General Features. 



In Table I the general features of the pupae are tabulated. The figures given are 

 the averages of the measurements made in each case. The specimens of C. invidiosus 

 examined were on the whole shghtly smaller than those of C. decens. It wiU be 

 observed that the general features of the two pupae were similar. 



Table I. 

 General Features of the Pupae of C. decens and C. invidiosus. 





0. decens 



G. invidiosus. 



Length of pupa, extended 



4r-4t^ mm. 



4-4^ mm. 



Eespiratory trumpet, 







total length 



640/. 



580;. 



length of the open portion 







(pinna) . . 



170^ 



160;. 



ratio of the length of the 







closed portion (meatus) 







to the total length 



1 : 1-4 



1: 1-4 



Length of the tuft (A) at the 







posterior angle of the 







seventh abdominal seg- 







ment 



210^ 



190;. 



Length of the tuft (A) at the pos- 







terior angle of the eighth 







abdominal segment 



210;. 



190;. 



Paddle, length 



750^ 



740;. 



breadth . . 



530;. 



530;. 



ratio of length to breadth 



1-4; 1 



1-4: 1 



Cephalo-thoracic Setae. 



The setae on the cephalo-thorax of these pupae are aUke, and are similarly situated 

 to those of Stegomyia fasciata (loc. cit.) ; they do not require special description. 

 Details regarding the subdivisions of the cephalo-thoracic setae are furnished in the 

 following comparative table (Table II). 



