172 Mr. J. O. Westwood on the Strepsiptera. 



and which, had they existed, would surely not have escaped the no- 

 tice of such observers as J urine, Kirby, Latreille, Passerini, and 

 Curtis. 



With respect to Mr. Newman's identification of the structure of 

 the mouth of these insects with that of the Diptera, this gentle- 

 man admits that he did not dissect it. I will therefore only ob- 

 serve that I cannot find the least analogy between the oral or- 

 ganization such as it is in Stylops, and the tubularly developed 

 elbowed mouth of the Diptera, the labium of which is greatly elon- 

 gated ; whereas, on the contrary, there seems to me much greater 

 resemblance in this respect between the Strepsiptera and Lepido- 

 ptera, the labium in both being soldered flatly to the head, the acute 

 mandibles, as they have been termed in Stylops, representing the 

 maxillary tongue of the butterfly, and the large palpi being much 

 more analogous to the labial palpi of the Lepidoptera than to the 

 maxillary palpi of the Diptera. 



The rare opportunity of examining a living Stylops induced me to 

 make a series of figures, from which those in the accompanying 

 plate have been selected, and of which the following is the descrip- 

 tion. 



PLATE XVII. 



Fig. 1. Stylops Spencii, Pickering, magnified. 



2. Ditto, with the wings closed, 



3. Ditto, ditto, seen laterally. 



4. Head of ditto, seen from beneath. 



5. Ditto, ditto, seen in profile. 



6. Metathorax and abdomen seen laterally, the wings and legs truncated, 



7. Metathorax seen from beneath. 



8. Tarsus. 



9. Larva greatly magnified, seen from above. 



10. Ditto, seen from beneath. 



11. Ditto, seen laterally. 



12. Anterior portion of ditto, showing the cord («) by which it is attached 



to the abdomen of the bee (i). 



13. Exuviffi of larva remaining in the ^body of the bee. (a.) Exuviae of 



pupa remaining within the exuvias of the larva. 



14. A cord observed near the neck of the exuviae of the larva. 



