1867.] 325 [Scudder. 



times as long as tlie second. It Is possibly the second species, but I 

 would not detach the animals for an accurate examination before the 

 Section had seen it. The third species was described by Linna>us in 

 his lOtli Edition of the Sy sterna Naturaa as A cams scorpioides from 

 Surinam and in the r2th Edition, as PJtalanfjium acaroides. De 

 Geer in his Memoires, Vol. vii, has described and figured the same 

 species as Chelifer Americanus. This was the species which I re- 

 ceived from Venezuela. 



The fact that an animal changes its location by means of another 

 animal is interesting, and it is evident that this way is taken either 

 from laziness, or from incapacity to accomplish his purpose in any 

 other way. In the Chelifer^ whose movements are slow, this means 

 of locomotion is apparently adopted to finrl suitable food more easily. 

 Necessarily such a state of things cannot be unique in natm-al history. 

 I confess that at present I know nothing analogous to it among insects 

 except the case of the larva; of Meloe, the well-known Triunf^/ulmus, 

 which creeps upon bees on purpose to bs taken into their nests. 

 Something analogous exists, I think, among fishes. Eckeneis re- 

 mora is often found attached to other fishes liy a peculiar apparatus. 

 But the purpose in the Eclieneis is not very clear, for this species 

 swims very quickly. The apparatus for the attachment of Ciiclopterus 

 Luynpus is quite different; its purpose is not known. 



Ml-. B. P. Mann said that he had received a specimen of 

 Alaus oculatus from Ohio, beneath the elytra of which a 

 CJielifer was found. 



Mr. S. H. Scudder exhibited a curious specimen of Dia- 

 pheromera feniorata. 



One of the fore legs, broken off in early life, had been i-eplaced by a 

 new one, less than half an inch in length; the femur was perfectly 

 formed but diminutive, the tibia not quite so long as the femur and 

 a little curved at the tip. The tarsal joints were malformed; the first 

 joint was about one quarter of its usual length; the second joint 

 was wanting; the third, fourth and fifth joints were of about the ordi- 

 nary size, although the last one was unprovided with either claws or 

 foot-pad; jsossibly, as in the case mentioned by Newport, it was the 

 third joint that was wanting. Tlie animal had been kej^t alive for 

 several weeks, during which time she had laid many eggs ; her death 

 evidently resulted from the rupture of a membrane while ovipositing, 

 as two eggs could be seen protruding from the extremity of the abdo- 

 men at once, one fi'om the usual place, the other from the anal orifice ; 

 the first egg was withdrawn into the oviduct by the contraction of 

 the parts in drying, but the egg in the vulva could still be readily seen. 



