106 [Januarv 



fifth joint; joints cylindrical; the first a little longer than the second; sec- 

 ond and third of the same length; fourth joint short, slender, attenuated 

 at the tip, inserted at an angle to the axis of the antenna ; mandib/es horny, 

 very strong, with three blunt denticulations at the tip; their stout basal 

 portion emits a strong tooth, concealed inside of the mouth (this is the 

 description of the left mandible; the n'fjht mandible of my specimen seems 

 to be more worn, as it has neither denticulations at the tip, nor an inner 

 tooth); nidjtllse: stout cardinal piece, placed obliquely; basal piece elon- 

 gated, subcylindrical, horny; it bears two lobes; the outside one, close by 

 the palpus is coriaceous, elongated, beset with stiff bristles and ends in a 

 blunt point, directed upwards (towards the labrum); the inner lobe (con- 

 cealed inside of the mouth), is shorter and ends in a strong, horny, curved 

 point; it has some bristles on the inside, near the base; maxillary palpi 4- 

 jointed; joints short, subcylindrical; second joint a little longer than the 

 third; last joint likewise longer, pointed; mentmn quadrangular, somewhat 

 narrowed at the base; paljiigerous piece transverse, rounded on the sides, 

 excised in the middle and beset with bristles; labial palpi 2-jointed; first 

 joint short, stout, tuberculiform ; second joint small, narrow, almost rudi- 

 mentary. 



Thoracic .si'i/moits narrower than those of the remainder of the body; 

 the first with a horny, almost square piece on each side of the back and 

 with a few scattered hairs; flic fccf with a few scattered hairs: coxas cy- 

 lindrical, elongated, but little shorter than the remainder of the foot; fem- 

 ora and tibijie almost soldered together, a vestige of a joint being percep- 

 tible only on the upper side; the first are subcylindrical, the latter incras- 

 sated at the base, attenuated at the tip, which is crowned with a few min- 

 ute bristles, and two longer hairs, evidently representing rudiments of un- 

 gues. 



Alxlnmrn very convex, bag-like on its back, glabrous, with the excep- 

 tion of a few scattered hairs; dorsal segments with transverse folds in the 

 middle; under the anal aperture there is a semicircular, coriaceous piece, 

 densely covered with short bristles, except in the middle, which is smooth 

 and shining; it probably aids the larva in its motions. 



Each larva Avas found enclosed in a globular case of dung or earthy mat- 

 ter, about an inch and a quarter in diameter. Early in spring, I found 

 these cases imbedded in the sand on the banks of the Potomac. The lar- 

 va) underwent their transformation in confinement in the course of the 

 summer, and although the pu])9e died before the exclusion of the perfect 

 iiis(!ct. their form proved without any possible doubt that they were Cnjin's 

 (■(iriilniii. 



