355 



Zuvldum? bicolor, N. E. F. vol. vii. p. 117, is the Helluo prauslus, 

 Dejean; and Diccelus Leonardii, ibid, p. 132, is D. politus, Dejean. 



Through inadvertence the description of Dytiscus thoracicus, (N. E. F. 

 p. 156) Avas offered for publication; it is identical Avith D. libcrus of Prof. 

 Say. Avho described it in the Journal Acad. Nat. Sciences, in 1825, from 

 specimens sent him by me. The following should have occupied its place 

 in the Farmer. 



Dytlscus *basillaris. Black, levigated, impunctured; dilated frontal spot 

 and transverse vertical line on the head, lateral margins and transverse 

 narrow fascia of the thorax, humerus, obsolete external margin and inter- 

 rupted basal fascia of the elytra, yellowish. Palpi and four anterior feet 

 pale ochreous yellow; hinder pair piceous, thighs paler. Elytra Avith three 

 series of punctures, external one faintly impressed, sutural series none. 



Length tAvo-fifths, breadth a little more than one-fifth of an inch. 



Specimen a male in the cabinet of W. Oakes, Esq. 



The following supposed neAv species of Colymbetes, for which I am in- 

 debted to Mr. Oakes, Avas captured by him in Ipswich, in November 1828, 

 and Avas received too late for description in the sixth number of the Con- 

 tributions. 



Colymbetes *sculptilis. Black, acuducted; head, before, and external 

 margins of the elytra yelloAv; a transverse, ferruginous, vertical spot; tho- 

 rax yellow with black spots; elytra transversely striated; feet ferruginous. 



Length eleven-tAventieths, breadth over three-tenths of an inch. Body 

 black, elliptical. Head Avith minute, short, irregular, acuducted lines, 

 black; nasus ochreous; a transverse, ferruginous, vertical spot, and an 

 oblong indentation near each eye. Thorax, Avith rivose impressed lines, 

 ochreous; two confluent, transverse, central spots, a lunated oblique one on 

 each side, and tAvo linear ones, sometimes interrupted into four, near the 

 base, all black. Elytra polished, transversely and regularly striated or 

 acuducted; a subsutural, IAVO central, and a submarginal dilated series of 

 punctures; external margin and epipleura ochreous. Body, beneath, Avith 

 abbreviated, irregular, transverse, acuducted lines, black, ventral segments 

 piceous at tip. Feet dark ferruginous. 



This species is of much more attenuated and elongated form than Dylit- 

 cnsfuscits and striaius, F. to both Avhich European species it is closely allied. 

 The anterior orbitar process, which projects over the eye in front, is very 

 conspicuous in this species, and we find it more or less so in every one of 

 the genus, for the determination of Avhich it is an excellent auxiliary 

 character. 



[The remaining corrections have been inserted in the text.] 



