THE CANADIAN ENTOMOLOGIST. 249 



Cymatodera, Gray. 

 The two Canadian species are of elongate form and readily distin- 

 guished thus : — 



Black, thorax yellow, basal and apical margins black ; femora at 

 basal half and two basal joints of antennae yellow. .30 



-.36 in bicolor, Say. 



Brownish or piceous, antenna? ferruginous, legs brownish, the cox£e 



and tarsi paler. .30-.36 in inornata, Say. 



Priocera, Lee. 

 The only species is P. castanea, Newm., known by the generic char- 

 acters. In colour it is rufous, shining, wilh long, sparse pubescence. 

 Each elytron with two yellow spots near the middle, and a broad black 

 band. Occasionally there is an additional small yellow spot at base. 

 The feet are piceous. .25-40 in. 



Trichodes, Hbst. 

 These are very pretty blue or black insects, banded with red or 

 yellow, found on flowers, especially Umbellifera^, during the summer. 

 The two Canadian species separate easily thus : — 



Elytra rather finely punctate, bluish, with basal, median and 

 subapical red or yellow bands. .40 in. (fig. 



17) Nuttalli, Kirby. 



Elytra coarsely deeply punctured, red with two transverse 



bands and tip black. .46-.60 in apivorus, Germ. 



The figure of T. Nuttalli is made from a specimen show- 

 ing rather less red than usual, the extent of this colour being 

 quite variable. In the Western Provinces it is replaced by 

 Fig. 17. J- of'jiatus, Say, a still more variable species, in which the 

 middle band is always more oblique than in Nuttalli ; anterior to this 

 band is usually found a very distinct red or yellow subsutural spot on 



each elytron. 



Clerus, Geoffr. 



Several species of this genus vary so much in colour as to make 



their recognition from description rather difficult. The abdomen, for 



example, may be (in quadrigutiatiis) either rufous or black, and in some 



others the elytral ornamentation varies greatly. They may be found 



about flowers or on freshly-cut timber, resorting to the latter probably for 

 the purpose of egg-laying, since the larvae prey on those "of wood-boring 

 insects. The Canadian forms separate thus, though intermediate patterns 

 of coloration, which I have not seen, may perhaps occur: — 



