248 [November, 



the striae ; surfnce glabrous, the apical part only clothed with sparse, erect 

 hairs; external apical angles with visible serration. Abdomen concave; the 

 almost vertical 2nd segment iu both sexes with a short obtuse process, which 

 is flattened at sides and placed at some distance from the basal margin of this 

 segueut ; in the male the apical margin of the 4th segment is thickened in the 

 middle ; the abdominal segments of the mule are clothed with very fine erect 

 liairs, more or less evident around tlie outer area, but very sparse in tlie centre ; 

 in the female these hairs are equally placed, curved at the ends, and mucli 

 longer than those of the male. The hind tibiae are provided with long- 

 scattered hairs in both sexes. 



l'roventricult(s small and faint. Proventricular plate (dg. 4) provided 

 with tubercle-like (jbtuse teetli, which become transparent, line, and sharp on 

 the under part of the plate; all these teeth are placed in more or less regular 

 tran.-verse rows ; the laminate teeth (/;) are not numerous and their margins 

 are simple. 



llie organ of reproiludion of the male (fig. 5) is of a very peculiar form 

 owing to its asymmetry. One of the lateral folds (b) is more developed tlian 

 the other : the terminal plate (d) lies asymmetrical to the body of the organ, 

 and is in the form of a curved tube, the widened base of Mdiich is provided 

 with a closed caviforni ])roce,>-s {d') ; this pi'ocess is divided in two branches, 

 one of which is considerably shorter than the other; the apex of the terminal 

 plate is widened into a funnel, clothed with a glabrous lanuna, which may be 

 consideied to be a praeputial coat. 



Under tlie bark of JJImus sp. The longitudinal egg-galleries usually 

 begin with a widened entrance-chamber ; the majority of tlie galleries 

 arc 10-12 mm. long : the longest one is 20 mm. and the shortest 5 mm. 

 long ; the broad-galleries are nearly four times as long as the egg- 

 galleries ; tlie}^ lie at first perpendicularly to the egg-gallery, then take 

 mostly a longitudinal direction. Both the egg- and broad-galleries are 

 e([ually but very superficially engraved in the wood. 



Twenty-one specimens and two trunks with several galleries. 

 Neighbourhood of Vladivostok, 1915, Mr. B. Berger, collector ; Man- 

 churia, 191G, Mr. V. Verbicky, collector. 



I name this species in honour of Mi'. A. Semenov, the well-known 

 Ivussian Entomologist, President of the Ilussian Entomological Society 

 and Honorary Fellow of the Entomological Society of London. 



Hylesinus eos, sp. ii. 



Length 2-25-3 mm. In size and shape and in colour of elytral vestiture 

 resembling Hylesinus fraxini Panz., but distinguished by the following cha- 

 racters : (1) front iu the male impressed, in the female somewhat concave ; 

 (2) pronotum dull and dark, almost glabrous, without scales, sparsely covered 

 with short downy, yellowish-grey hairs, which become denser and longer on 

 the posterior area ; (3) interspaces 1st, 3rd, and 9th of the el^'tral declivity 

 somewhat elevated, the 2nd impressed ; (4) interspaces 1st, 3rd, 6th, 7th, and 



