258 



Transactions . — Zoology. 



upwards ffig. 7) ; at rest, these are folded together (fig. 8) ; 

 when opened (fig. 8a) two are long, cornute with sharp ends, 

 and four others, shorter and tubercular, enclose a short 

 cylindrical ovipositor. Abdomen of male ending (fig. 9) in 

 two lobes ; when exserted (fig. 9a) the penis is thick, cylin- 

 drical, somewhat dilated at the tip. 



Length of the body about ^in. ; length of legs about -lin. 



In the venation of the wings this insect belongs to the true 

 genus Cccidomyia, as defined l3y Osten-Sacken. In the genus 

 Diplosis, which is near it, the second longitudinal vein curves 

 downwards and reaches the margin of the wing below the tip. 

 As regards specific distinctions, I have not sufficient material 

 for complete comparison : possibly the presence of the curious 

 and very loosely-attached black scales on the body may be a 

 differentiating character. 



INDEX TO PLATES XI. AND XII. 



Plate XI. — Eurytoma olearice. 



Gall on twig of Olcaria fnrfuracca 



Section of ditto, showing enclosed insects. 



Larva . . 



Head of ditto 



Pupa extracted from case . . 



Pupa-case. 



Perfect fly 



Antenna of male 



Antenna of female 



Foot 



Spur on tibia and first joint of tarsus of front legs 



Spur of tibia and first joint of tarsus of hind legs 



\Ving3 . . 



Abdomen 



Ovipositor of female 



Penis of male 



Spermatozoa of male 



Plate XII. — Cccidomyia olcaria; 



Gall on twig and blisters on leaf . . 



Section of leaf-blister. 



Section of gall. 



Bundle of eggs on young shoot 



Eggs .. .. ... 



Head of larva . . 



Pupa 



Perfect fly, female 



End of abdomen of female, at rest 



Ditto, open 



End of abdomen of male, at rest 



Ditto, penis exserted 



Wing and haltere 



Antenna of female 



Foot 



Scales . . . . . . 



Reduced 



X 12 

 X 40 

 X 10 



10 

 40 

 40 

 40 

 40 

 40 

 15 

 15 

 30 

 30 

 X 1,000 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



Natural siz& 



Slightly enlarged 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



la 



10 

 40 

 10 

 10 

 20 

 20 

 20 

 20 

 10 

 25 

 10 

 350 



