REVISION OF STEEPSIPTERA PIERCE. 57 



linids was captured. Thus the inference may be drawn that there is 

 a continuous series of breeding through the summer, or at least a 

 double brood. 



PSEUDOXENOS HEYDENII Saunders. 



Saunders (1852) records triungulinids of this species on July 13 

 and August 9. These young he found to have distinct saltatorial 

 powers. The males emerge from the puparium with the ventral 

 side up, although the puparium is oriented, as in Hylechthrus , with 

 the dorsum up. The only date of maturity for the male is July 13. 



ELENCHUS, species. 



Green (1902) captured a male corresponding almost exactly to 

 the figure of Elenclius tenuicornis at night in an acetylene-gas moth 

 trap at Paradeniya, Ceylon. Tins record is worthy of thoughtful 

 consideration. 



ELENCHOIDES PERKINSI Pierce. 



Muir (1906) says the males hatched out in the breeding jars 

 between sunrise and 7 a. m. and were dead by noon. 



They are very feeble upon their legs and keep their wings in rapid vibration all 

 the time they are walking. When on the wing they take up a perpendicular posi- 

 tion with their antennae erect and the tip of their abdomen turned slightly under. 

 Sight seems to be the chief sense by which they detect the presence of the leaf 

 hoppers, as I have seen one hovering along one side of a leaf with half a dozen 

 stylopized hoppers on the other side, only a quarter of an inch away, and apparently 

 not knowing of their presence, but should a hopper but show its antenna over the 

 edge of the leaf the Elenchus darts toward it and hovers over its back. 



INTERNAL STRUCTURE. 



In their internal structure the Strepsiptera exhibit several striking 

 peculiarities, and throughout show high specialization. This part of 

 the paper must necessarily be drawn mainly from the excellent arti- 

 cles by Nassonow, which, being in Russian, are inaccessible to most 

 English-speaking entomologists. So well, however, has his work 

 been done that one not cognizant with the language may yet gain 

 much information from the plates. The writer has fortunately had 

 access to a complete English translation of one of the articles and with 

 the aid of a dictionary has been able to gather the meaning of Ins 

 other plates and in some places of his text. If important observa- 

 tions are overlooked or the plates misinterpreted, it is due to the 

 writer's inability at present to grasp the science of the Russian 

 language. 



ALIMENTARY SYSTEM. 



The triungulinid is so minute that the character of the intestinal 

 canal could not be studied, but in the first parasitic instars it may 

 be observed. It is then a straight tube passing through the body 



