Sanborn.] 90 [-June 24, 



bago. of the foliated variety, and huge crystals of pyroxene or augite, 

 one of which measures six inches in length and three inches in 

 diameter, and is well terminated at one extremity. 



The President announced that members of the Society 

 would hereafter be permitted to invite the attendance of 

 k.die.i on the second meeting of every month. 



Section of Entomology. June 24, 1868. 



Mr. L. Trouvelot in the chair. Twelve members present. 



Mr. Francis G. Sanborn read tlie following description of 

 the larva and pupa-case of Microdon f/lobosus Fabr. 



A singular brownish object of an oval hemispherical form, has often 

 excite 1 the curiosity of the field student of P2ntomology, while prying 

 off the bark from decaying stumps, and raising mossy stones in the 

 outskirts of some grove. Its form, unlike any familiar shape of in- 



Fipr. 1. Pupa case. Fig. 3. Anterior view 



s. Spiracular tubercles. Fig. 2. of pupa case. 



V. Vent. Larva just before pupation. 



sect's cocoon, tempts him to throw it over to the tender mercies of 

 those versed in Crustacean or Molluscan lore, but its vacant interior 

 and its curiously reticulated structure, together with its extreme del- 

 icacy and unvarying regularity, gives his entomological conscience a 

 sharp twinge, whether he places it among the res iqnotae of his cabi- 

 net, or discards it as being neither bag, beetle, nor good hymenopte- 

 ron. Its general form is that of a somewhat elongated hemisphere, a 

 little over .4 in. in length, and .3 in. in breadth, of a warm reddish- 

 brown, surrounded by a fringe of short ciliEe at its base. Its surface 

 is covered with minute tubercles arranged in irre^tular, intersecting, 

 longitudinal lines, connected by short transverse ones, giving it a 

 reticulated appearance, while the interstices, which are larger on 

 the lateral disks, are smooth, but not polished. 



The tubercles composing the three lower lines on each side, 

 and the seven highest, are rather larger tlian the others, oivin<T tliese 



