AMERICAN COLEOrTERA. 39 



longed into two slender, arcuate, corneous processes with their surface 

 subniuvicate and with very short splnules. The connecting menabrane 

 between the dorsal and ventral segments is distinctly visible from 

 above and bears a nai-row corneous plate opposite each segment. The 

 ventral aspect of each- segment from 1 — 7 consists of seven semi- 

 corneous plates arranged as follows : a transverse piece along the 

 anterior margin of the segment, behind which are four smaller sub- 

 quadrangular pieces and en each side toward the margin of the seg- 

 ment a narrow longitudinal piece. The marginal piece of the connect- 

 ins: membrane is also visible from beneath. In the eighth segment the 

 pieces are all united in one excepting the two lateral. In the ninth 

 segment all are united. The anus is prolonged into a corneous tube 

 equal in length to any of the preceding segments. 



Spiracles. — There are nine pairs of spiracles. The anterior is the 

 largest and is situated under the anterior angle of the mesotlioracic 

 segment. 'J'he other spiracles are situated in the dorsal portion of 

 the connecting membrane near the anterior angles of segments 1 — 7 

 respectively. 



Legs are gradually longer from the first to the third pair, the coxoe 

 are prominent and conical, the femora longer than the coxae, gradually 

 broader toward the tip and with an oblique impression anterior to the 

 middle. The tibial piece is a little longer than half the femur, slightly 

 clavate. The tarsal piece slender, as long as the tibia and furnished 

 with two small equal claws. 



From the letter of Mr. Sehaupp I learn that the larva when full 

 grown transforms itself in a very short time into the pupa, occupying 

 probably but little more than an hour's time. It remains in pupa 

 seven days and requires three days more to become of full color. 

 During the change from larva to pupa the form expands considerably 

 so that it would not le supposed that so large an insect had been 

 produced from so small a larva. 



Rliyncliophorus cruentatus, Hbst. 



Mention is made of this species to correct an error which has crept 

 into all mention of the larva. 



There is but one pair of spiracles. These belong to the prothoracic 

 segment and are situated at the side immediately beneath the margin 

 of the plate forming the large dorsal scute. Chapuis and Candeze 

 speak of nine pairs of spiracles but a carefully prepared skin shows 

 the prothoracic pair only. 



The credit of this discovery is due to Dr. Leconte. 



