66 NEW YORK STATE MUSEUM 



with a diameter of nearly a quarter of an inch, leading into a 

 complex series of galleries (figure 12), some of which were occu- 

 pied by a number of cells. The latter are not lined by leaves as in 

 the genus Megachile, the separations apparently being composed 

 mostly of comminuted particles of bark. The individual cells are 

 evidently divided much as in Megachile, and the larvae, on attain- 

 ing maturity, spin yellowish brown, oval cocoons occupying the 

 entire diameter of the gallery and with a length of approximately 

 five-eighths of an inch. A parasite, Leucopsis affinis Say, 

 was reared from wood containing the cells of this insect. 



White-winged Bibio (Bibio albipennis Say) . Dirty 

 yellowish gray larvae of this species were found March 26, 1900 

 by Mr W. F. Smith, White Plains, N. Y., in stable manure spread 

 the preceding fall on flower beds. The larvae pupated in oval cells 

 in the earth, and hosts of adults emerged April 18th. The black 

 flies, with a length of only three-eighths of an inch, have white 

 wings when they first appear above ground. These soon become 

 transparent. This insect is a common species about gardens and 

 orchards in early spring. 



Larva. Length about 1.3 cm, diameter 2 mm. Head reddish 

 brown, strongly chitinized, the dorsum with a sublateral seta near 

 the anterior third, a little below this there being apparently a 

 rudimentary eye. Labrum subquadrate, rounded anteriorly ; mandi- 

 bles moderately large, subtriangular, rounded, bidentate. The 

 maxillae appear to be represented by a pair of ventral, irregularly 

 ovate sclerites. The labium is subcordate. The body is a dirty 

 yellowish gray, rather strongly annulate and composed of 12 seg- 

 ments, the anterior 4 being divided into 3 annuli, the divisions on 

 the other segments less marked. There is at the posterior third of 

 the segments, on the middle annulus in the anterior ones, a trans- 

 verse row of short, stout, fleshy processes, which latter are some- 

 what produced laterally and on the posterior segment. The skin is 

 coarsely shagreened. On the first body segment there is a moder- 

 ately well-developed brown spiracle, rudimentary ones being seen 

 upon succeeding segments to the twelfth, which latter has a well- 

 developed sublateral spiracle on the anterior fourth. The posterior 

 extremity is obliquely truncate, excavated, the anus being guarded 

 by two broadly oval, subdorsal flaps, a pair of subventral triangular 

 processes and a ventral rounded lip. 



The use of ground, unslaked lime or naphthalin is advised by 

 Collinge for the destruction of larvae of the allied Bibio marci 

 Linn, in leaf mold, in which they occur. 



