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other yet known in this family; while at the same tiinc*. 

 the above description., taken in conjunction with its 

 habitat forbid the supposition of its belonging to any 

 other group, and will, I think, justify the restoration 

 to its place in the system of the Linnaean oestrus ho- 

 minis. To which of Latreille's recently established 

 genera it belongs, is at present impossible to deter- 

 mine, though, for the present, it may, perhaps, be not 

 unsafe to refer it to the Cutebra* of Clark. 



Since the above was read to the academy, Dr. Har- 

 lan has furnished me with the following interesting 

 extract of a letter, which he received from the gentle- 

 man from whose leg this larva was extracted : 



" After a very sultry day's march, and being very 

 much fatigued, I went to bathe in the Chama, a small 

 stream emptying in the lagoon of Maracaibo. Not 

 long after coming out of the water, I received a sting 

 from some insect, in the left leg, over the upper and 

 fore part of the tibia ; it was several days attended 

 with a considerable degree of itching, but without any 

 pain, and I continued on my journey some few days 

 longer without experiencing much inconvenience, ex- 

 cept during several periods of perhaps two or three 

 minutes continuance, when an acute pain came on 

 suddenly, and was severe whilst it continued, and 

 then as suddenly subsided. On my arrival and du- 

 ring my continuance at II. Rosario de Cucuta, I walk- 



* Weidemann in a letter states to me his preference of the 

 v^rm Tryfioderma for this genus. 



