6 THE CANADIAN ENTOMOLOGIST. 



have the organs alike. On the penultimate segment you find outside and 

 behind the stigmata two large white spots, each one of which evaginates a 

 white membranous tube, just like the finger of a glove, the top of which 

 is not entirely drawn out. I have seen the tube frequently, and if 1 blow 

 a little the tube is invaginated instantly. On the antepenultimate seg- 

 ment is a larger and transversal opening behind and between the stigmata 

 near the apical border. It looks like a closed mouth with its lips, but I 

 have not seen anything protruding from it. But in an alcoholic larva 

 of argus I saw an ovoid evagination." Recently I sent Dr. Hagen mature 

 larva; of comyntas in alcohol, and he writes : " I was able to ascertain 

 exactly the same parts and in same situations as in pseudargiolus."* Dr. 

 Hagen also referred me to a paper by M. Guenee', Ann. Soc. Ent. de 

 France, ser. iv., vol. 7, 1867, pp. 696-7, and plate 13, in which are 

 described and figured similar organs in Lye. baetica. Guenee' relates 

 that while observing the larva of baetica, he noticed two openings alto- 

 gether like those of the stigmata and nearly of same size. At first he 

 thought they were superfluous stigmata, and puzzled himself with conjec- 

 turing the object of them ; but as he turned the caterpillar about in order 

 to see the partings of these openings which seemed to be different from 

 the stigmata, the larva, which this handling disturbed, suddenly made to 

 leap out of these holes a peculiar body which he cannot compare to anything 

 better than to the tentacles which certain polypi put forth at will. "This is 

 a soft, cylindrical organ, the extremity of which is furnished with little fleshy 

 points resembling hairs, some standing upright, some radiating from a 

 point on the summit. This singular object placed under the highest 

 power of the microscope, these apparent hairs are seen to be long tenta- 

 cles and themselves bristle with fleshy spines. Those at the circumference 



* The accompanying figure represents the last segments of pscudargiohts larva, and 

 the position of these organs : 



S *»-^ *->_/' % a — stigmata on nth and 12th segments; b — spots resembling 



\/° g— 5_J> /©li stigmata on 12th segment ; b 1 — processes issuing 



/li^fX" T^M Vrf* therefrom; c — opening on nth seg- 



\P. »■<* / /&&\ mentis 1 — ovoid membrane. 



*#<ZS J { 



The processes b x are but partly protruded and as Dr. Mack saw them. 



