same line with the thoracic sti<;ina. IJetween each pit and the sti<>nia of 

 the same segment, a sniall excavation, finely striated at the bottom, is per- 

 ceptible close by the incisure, the anterior portion of this excavation be- 

 ing covered by the posterior margin of the previous segment. 



This larva was communicated to Dr. LeConte by Benj. D. Walsh Esq.. 

 in Rock Island, Til., as being probably that of Zrnoa picrn. He had found 

 it under bark, in Southern Illinois, together with the perfect insect. 



Mr. Caudf^ze in his recent pamphlet (Hist, des metam. de qlq. larves 

 exot. 1801) describes a larva from Ceylon, which shows the closest resem- 

 blance to the above described one. But Mr. Candeze's larva was sent to 

 him as that of an elaterideous insect, Campsosternus Templetonii. 



Dr. John L. LeConte. to whom I communicated my doubts on this sub- 

 ject, informed me that a clerical error had probably been committed in re- 

 gard to " Cfonpsostenm.s" as there is a CaUlrhlpix Tcniph'tonl! from Ceylon. 

 which genus is next to Zi'noa. Thus there can be no other doubt, I think, 

 about the family to which both larvae belong. 



The differences between these larvae are immaterial. An ocellus on 

 each side of the head was distinctly seen on the larva from Ceylon ; I could 

 not perceive any on mine ; besides, the antennae of my larva are shortei-, 

 but, as they seem to be retractile, this shortness may be only apparent. 



But I differ from 3Ir. Candeze in the interpretation of the two rows of 

 pits on the abdominal segments of the larva. He takes them for stigmata 

 and says, in accordance with this supposition, that the larva has the ab- 

 normal number of six pairs of stigmata on the abdominal segments and 

 none on the thorax. My larva shows, as stated above, the normal arrange- 

 ment of these organs: a pair on the thorax and eight pairs on the abdomen. 



These stigmata, although very small, are quite distinct and placed on 

 each side below the row of dorsal pits. With a strong lens, a double slit 

 may be seen at the bottom of each. Mr. Candeze mentions "small depres- 

 sions with an elevated margin and smooth bottom" which he perceived on 

 each side of the anterior abdominal segments, below the pits, and which 

 were obliterated on the posterior segments. May they not be the true 

 stigmata ? 



■J-* 



PTILODACTYLA ELATEKINA Illi?. 

 (Plate 1. Fig. -A.) 



Larva 0.35 — 04 long, cylindrical above, venter flattened ; head and thor- 

 ax a little broader than the remaining segments; consistency horny on 

 the dorsal segments, softer on the ventral ones ; head and thorax horny, 

 reddish-brown; dorsal segments yellowish-brown, venter paler; the body 



