562 TRANS. ST. LOUIS ACAD. SCIENCE. 



occur on all the specimens I have examined (40), but they are but modified 

 setae, and may exceptionally be noticed in vittata and more often in mar- 

 ginata. The subsequent states show no structural differences from the 

 other species. 



Macrobasis unicolor (Kirby). 



The triungulin of this species is yet unknown tome, but from the coarc- 

 tate larva to the imago I have noticed no characters of any importance or 

 value which would distinguish it from the previous species. 



Hefious confertus (Say). 

 The eggs of this species, which also feeds on Potato, I have had laid in 

 July. They are 1.8 mm. long, \ as wide, and differ from those of the other 

 species described, in being of a deeper yellow and more compactly glued 

 together in the lump by means of a reddish, glistening fluid, which sepa- 

 rates in globules between the eggs and pulls in fine, web-like threads. The 

 triungulin measures 3.2 mm. in length when first hatched, but otherwise 

 differs but little from that oi vittata. The dark brown color is more often 

 confined to the lower corners of the prothoracic joint, and never occurs on 

 joints 4 and 5 ; the head is rather more rounded ; the mandibles are slightly 

 more feeble, with only about 8 rather stronger teeth. The spinous hairs 

 are somewhat more numerous and longer, but there are no short conical 

 spines : the abdomen tapers less, being more nearly of a diameter with 

 head and prothorax, and thus giving a heavier, more clumsy look; the 

 dark eyes have a pale centre; the antennal maxillary and labial characters 

 agree with those of ^ pennsyloanica, and the caudal hairs sometimes ex- 

 ceed the longest lateral ones but very little in length. I have not watched 

 it through the subsequentchanges, my notes being from specimens obtained 

 in 1874; but the triungulins act just as in Epicauta, and doubtless feed 

 on locust eggs. 



ADDITIONAL NOTE ON CANTHARIS. 



Since the first part of this paper was run off the press, a com- 

 munication from M.J. Lichtenstein has reached me.* He has 

 succeeded, by furnishing the larvae of C. vesicatoria with artificial 

 nourishment composed of the filled stomachs of honey-making 

 bees, and especially of Ceratina, in tracing the development from 

 the triungulin to the coarctate larva, which last differs from those 

 of the other species considered by me, in freeing itself entirely 

 from the second larva skin. He has thus established the fact that 

 Cantharis agrees with the other species of the family in its hyper- 

 metamorphosis ; but its natural habits remain as much as ever a 

 mystery, which, let me hope, the present communication to the 

 Academy may help to solve. 



* Comptes Rendus de I'Ac. des Sc, Paris, Oct. 11. 1877, p.628. 



