351 



exterual, depressed submargin wliicli is not, properly, a groove;) haii-s 

 depressed. The external groove commences at about one quarter of the 

 len2;th of the elytron from the base, the next to it is considerably longer, 

 the third from the margin is shorter than the second, but longer than the 

 first, and the submarginal groove is shortest of all. 



I have not the least doubt that this is the female of the above male, Avliieh 

 most closely resembles D. mediatus of Mr. Say. In the latter, of Avhich I 

 have seen the sexes, the body is rather less obtuse in front, and the elytra 

 of the female are not sulcated, but plain like those of the male; and prob- 

 t.bly belongs to Ihjdaticns of Leach. 



The fralernus is entirely distinct from the sidcatus of Europe, and with it, 

 belono-s to the subgenus Acdius of Leach. It is described from nine speci- 

 mens of the male, and six of the female. 



D. *fascicoUis. Convex, impunctured, pale testaceous ; vertical lunule and 

 base of the head, anterior and posterior thoracic fasciae black; elytra black- 

 ish, irrorate with distinct pale yellow dots, the external margin and an 

 abbreviated subsutural line yellowish; a distinct dorsal series, and three 

 others obsolete of imijressed setiferous punctures. Thorax of the female 

 obsoletely corrugated each side ; elytra smooth. 



Leno;th eleven twentieths, breadth over six twentieths of an inch. 



Variety. Body beneath and feet pale piceous. 



Specimens seven. Is probably refei-rible to Hi/daficiis. 



D. *thoracicus. Pale rufo-testaceous, impunctured, oval, and somewhat 

 convex; head and thorax immaculate; external margin of the elytra pale 

 testaceous, disc blackish with confluent, black tortuous lines; three dorsal 

 series of punctures. Female with obsolete ruga3 on sides of the thorax ; 

 elytra smooth. 



Length nine twentieths, breadth nearly three tenths of an inch. 



Specimens seven. Appears to belong to Hydalicus. 



[NeTT England Farmer, Vol. VII, No. xxi, p. 164, Dec. 12, 1828.] 

 CONTRIBUTIOXS TO ENTOMOLOGY. NO. VI. 



Family Dijthcidce, [Concluded.] 



The Dytisci are said to deposite their eggs in the bodies of dead aquatic 

 animals. Roesel states that they are hatched in ten or twelve days; the 

 larva comes to its growth the same season, when it leaves the water, and 

 forms for itself an oval cavity in the earth; in this it remains about fifteen 

 days before it becomes a pupa, and in fifteen or twenty days more it is 

 changed to a perfect insect. 



