1903] NATURAL SCIENCES OF PHILADELPHIA. 217 



iuhero-ajjims a worker pupa of L. Nylanderi, and they took care of it. 

 These ants never attempted to escape when I opened the box. They 

 impressed me by the delicacy of the sense of touch in their antennae, 

 as they felt of little particles with remarkable precision and distin- 

 guished their C[ualities (one of the eggs of their ciueen, a grain of dust, 

 a particle of honey, etc.). June 21 I gave them some pupce of Tetra- 

 morum ccBS'pitum which they killed and ate. On June 25 the pupa of 

 L. Nylanderi had hatched, and the residting worker lived on good terms 

 with the tubero-afflnis, working with them. June 28 I lost several 

 workers through carelessness; there remained only the queen with 

 five worker tuhero-affims and the worker Nylanderi; the small larvae 

 had grown considerably and began to pupate. June 29 one of the older 

 pupae hatched and the other soon followed, so that two worker tubero- 

 affinis were added to the colony. The same day I gave my ants worker 

 pupae of T. cwspitiim. They cared for two or three of the younger 

 ones and killed the others which were about to hatch, or rather allowed 

 them to die through neglect. July 15 three more small larvae made 

 their appearance. July 16 one of the two pnpce of T. cwspitum, which 

 they had continued to foster, hatched and lived thenceforth with these 

 ants of a different genus, on the best of terms. July 18 the second pupa 

 of T. ccespituni followed suit, but this worker was somewhat malformed 

 and died in a week. The first Tetramorium, on the contrary, pros- 

 pered apace; it was larger than any of the Leptothorax workers and 

 was conspicuous on account of its activity. It ran about continually 

 in all parts of the box, but kept returning from time to time to the 

 Leptothorax. By July 29 a fresh batch of little tubero-affinis larvae 

 had grown up, and the pupae of the second generation began to hatch. 

 August 16 I placed the seven surviving tubero-affijiis workers and their 

 queen in alcohol, as the colony had suffered considerably during my trip 



from Zurich to Vaux. It had lived in captivity four months 



"June 25, 1868, having found a formicary of L. acervorum in the 

 bark of a pine, with a winged female and some female pupae, I captured 

 and preserved it in a box till August 16. Several females hatched in 

 the box. The females of this species are not larger than the workers. 

 I often saw these little females carrying the larvae and pupae about 

 like the workers. Strange to say, nearly all of them lost their wings 

 within two or three days from the time of hatching. I even saw one 

 of them obviously endeavoring to rid herself of her wings by twisting 

 them about. As they w^ere born in a box containing no males, they 

 could not have been fecundated. Hence I cannot conceive why they 

 removed their wings. Can it be that the formicaries of Leptothorax 



