THE CANADIAN ENTOMOLOGIST. 35 



Orthaltica, Crotch. 

 O. copalina, Fabr., is an elongate-parallel insect, of shining surface, 

 brownish or blackish in colour. .08-10 in. long. The antennae are 

 more elongate than usual in the Halticini, equaling about two-thirds of 

 the length of the body in the male, somewhat shorter in the female. The 

 antennae and legs are rufotestaceous, the thorax is broader than long, 

 sides arcuate, margin finely serrate, punctures coarse and deep, but not 

 densely placed. Elytra with nine striae of closely- placed coarse punctures, 

 intervals narrower than the striae. I have found this species in abundance 

 on the flowers of sumach. 



Systena, Clark. 

 The species of this genus are rather elongate, somewhat depressed 

 or only moderately convex in form. The antennae are about one half the 

 length of the body. Some of them are injurious to cruciferous plants. 

 Two of the Canadian species are dark, the other two pale or vittate. 

 They may be separated thus : 



Black, head reddish. .14-.20 in frontalis, Fabr. 



Black, head not red; joints 3, 4, 5 of antennre testaceous. .18 



in hudsonias, Forst. 



Elytra pale or striped. 



Surface shining, punctuation fine ; may be entirely pale, or the 

 elytra may be vittate. Under side of body and sides of thorax 



often piceous. . 1 2-. 18 in tceniata, van blanda, Mels. 



Surface subopaque, punctuation coarse, close and deep. .14-16 



in marginalis. 111. 



LoNGiTARSUS, Latr. 



Three species have been reported from the region under discussion. 

 They all belong to the division of the genus in which the fourth antennal 

 joint is not longer than the second, and are distinguished by the use of 

 the following characters in the table of Dr. Horn : 



Surface entirely shining, form robust, elytral humeri well marked, 

 punctuation rather coarse. Colour blackish. .07 in. . . erro, Horn. 

 Surface more or less alutaceous, thorax always so, form more elon- 

 gate, humeri not prominent. 

 Elytra not shining, punctuation very indistinct ; colour yellowish- 

 testaceous. .07-.08 in testaceus, Mels. 



Elytra shining, punctuation coarse ; colour dark rufotestaceous to 

 nearly piceous. .oS in melaimrus, Mels, 



