INTRODUCTION. 



9 



cone being strongly chitinized and the apex being surmounted 

 by a balloon-shaped membranous structure which is capable of 

 being withdrawn inside the cone. When the larva is agitated 

 this extrusible structure is distended with fluid. 



Dorsally there are two parallel longitudinal series of dark 

 patches, which are strongly chitinized areas, four on the rneso- 

 thorax, four on the metathorax, and two on each abdominal 

 segment; on the sixth abdominal segment, where the body is con- 

 siderably narrowed, the two patches have coalesced to form one 

 large inid-dorsal patch ; on the seventh, eighth and ninth the 

 patches have similarly coalesced, the resulting single patches 

 being larger. On the underside of the abdominal segments there 

 are seven longitudinal series of similar patches, three ventral and 

 four ventro-lateral, two of these latter on each side ; owing to 

 the position of the legs these series are somewhat interrupted on 

 the underside of the thorax, but the presence of some patches 

 on the sides of the thorax maintains continuity in the series. On 

 the underside of the seventh, eighth and ninth abdominal seg- 

 ments the three ventral patches have in each case coalesced, as 

 have the patches on the dorsal side. 



Including the series of odoriferous orifices, the series of spirarles, 

 and those of the chitinized patches, there are altogether thirteen 

 longitudinal series of dark spots on the whole body of the larva. 

 The chitinized patches, more especially on the underside, bear a 

 few fine hairs each. 



The head, compared with the body, is very small, being only 

 about two millimetres broad ; it is more or less quadrate, dorsally 

 convex, sloping in front, the posterior end being uniformly 

 rounded ; along the middle there is a longitudinal suture which 

 meets two oblique sutures, one on each side, reaching the base 

 of the antenna; the antennae are very small, situated antero- 

 lateral ly and consisting of a base and three segments, the apical 

 one being very minute ; posterior to the antenna there is a group 

 of four ocelli on each side ; the entire dorsal surface of the head 

 is plain, except for one or two fine setae. Mouth-parts : labrum 

 narrow, much broader than long and with a slight emargination 

 in the middle of the anterior margin ; mandibles broad, each with 

 three blunt teeth and no molar part; maxillae each bearing a four- 

 segmented palpus; labium with a pair of small two-segmented palpi. 

 Thorax : the prothorax has a large dorsal shield of hexagonal 

 shape ; each of the thoracic segments bears a pair of legs on 

 the underside; each leg is composed of the following segments, 

 coxa, trochanter, femur, and tibia, ending in a strong claw. 



Russia. 



Colaphellus sophice, Schall. 



The following is a summary of observations recorded by 

 1ST. Sacharov in various parts of Russia. The insect has been 

 found breeding on wild CituciFEitJs, and especially on mustard. 



