Drilus.'] SERRICOKNIA. 175 



large in proportion to the males. The larva of the female Drilut 

 flavesi'ens is large and broad, 16 to 18 mm. in length and 8 to 10 mm. in 

 breadth, with short 2-jointed antennae; the body is composed of 

 twelve segments, of which the three first bear the legs, and the re- 

 mainder, except the last, are furnished on the under surface with two 

 conical fleshy tubercles, and on the upper with fascicules of hairs ; the 

 last segment is bifurcate, and furnished with a tuft of hairon each side ; 

 the larva is very voracious, and feeds on molluscs, especially Hdix 

 nemnralis ; it remains in the larval state all the winter, and then trans- 

 forms itself into a pupa, in which state it remains about twenty days ; 

 to the imago that came forth from this pupa Desmarest gave the name 

 of Cochleoctonus vorax, but he afterwards succeeded in rearing the male 

 from larvae of the same character, as well as in taking the sexes in 

 copuld ; a full account of these facts will be found in Westwood's 

 Classification, i. p. 253. 



D. flavescens, Rossi. Male black with the elytra luteous, clothed 

 with long and coarse yellowish pubescence ; head rather large, about as 

 broad as thorax, deeply impressed between eyes, thickly punctured ; 

 antennae fuscous black, strongly pectinate, or even somewhat flabellate 

 from the fourth joint inclusive, second joint small ; thorax transverse, 

 shining, uneven, rather strongly and closely punctured at base and pos- 

 terior angles, which are raised ; scutellum black ; elytra comparatively 

 sluut and broad, with fine and indistinct rugose punctuation and traces 

 of striae ; under-side finely punctured, sparingly pubescent ; legs fuscous, 

 with tarsi lighter. L. 5-6 mm. 



Female larvifonn, apterous, fleshy, of a fulvous colour, hairy, com- 

 posed of twelve segments, of which the last is terminated by two hairy 

 piocesses and a cylindrical appendage; the antennae are very short, 

 filiform, atd 10-jointed, and the legs moderately long, with short tarsi ; 

 the body is narrowed in front and widened behind. L. 18 mm. 



The male is found locally in chalky districts in open places on grasses or low 

 shrubs, and is sometimes not uncommon where it occurs ; it appears, however, to be 

 limited to the London, south-western, and southern counties ; Caterham, Durenth 

 Wood, Ashford, Qravesend, Chatham j Dover ; Folkestone ; Portsmouth district ; 

 Winchester ; Isle of Wight. The female occurs under stones, fallen leaves, or in 

 nail shells, and is extremely rare ; it has been taken on the Sussex Downs and at 

 Folkestone. 



In Dr. Power's collection there is a specimen referred to the female of 

 this insect labelled " West Cliff, Sandgate Roid, Folkestone, Sept. '72. 

 W. P. W. ; " it may be, and apparently is, much shrunk, but is entirely 

 different in shape to the figure given by Westwood (Classification, i. 

 247, fig. 26, 13), being almost balloon-shaped, very wide and round in 

 front, and much narrowed behind ; in other respects it agrees with the 

 description. 



In Do Mai-soul's "Nouvellcs et faits divers," No. H, May 1870 



