of neio species of TenthredinidcB, ^c. 397 



the sides being rounded : it has the apex of both the first 

 and second segments of the abdomen swollen as in O. 

 merdarius. 



2. Oj^hionflavopictus. 

 Female.— Length 7 lines. Rufous: the head, four 

 narrow lines on the thorax, the scutellum, the sides of the 

 thorax and of the abdomen, pale yellow. The eyes, ocelli, 

 and tips of the mandibles, black ; antennge rufous. Thorax : 

 the two central yellow lines on the mesothorax unite Avith 

 a quadrate spot before the scutellum ; the pectus, and 

 sutures of the thorax, rufous ; the coxas yellow outside ; 

 wings subhyaline and iridescent, the nervures fuscous, the 

 stigma pale. The first segment of the abdomen pale. 



3. Ophion unicolor. 



Female. — Length 4^ lines. Rufous ; eyes and ocelli 

 black ; wings hyaline and iridescent, nervures ferruginous, 

 stigma pale ; the tegulse and scutellum pale. 



Genus Xylonomus, Grav. 



L Xylonomus investigator. 



Female. — Length 7 lines. Black: the head shining, 

 finely punctured, the vertex nearly impunctate ; the thorax 

 and abdomen very closely punctured and semi-opaque. 

 The face and cheeks with a thin griseous pubescence ; the 

 palpi pale testaceous. Thorax pubescent, the pubescence 

 short, thin, and most observable on the sides and beneath; 

 the mesothorax with two oblique impressed lines, which 

 converge to the base of the scutellum ; the intermediate 

 space transversely rugulose posteriorly; the metathorax 

 has, at its base, a short central carina terminating at a 

 subtriangular enclosed space, from which two carinte branch 

 off laterally on each side ; the apex of the metathorax has 

 a series of radiating strife between two arched carina, 

 these caringe terminate laterally in short spines or teeth ; 

 wings subhyaline, their nervures black, the tegulaj pale 

 testaceous ; the four anterior legs ferruginous, the anterior 

 cox£e being yellowish outside ; the posterior tibire and tarsi 

 obscurely rufo-piceous. The first and second segments of 

 the abdomen punctured, the following segments very deli- 

 cately so. 



