24 HYMEXOPTERA FROM BORNEO. 



mark roundly dilated on to the mesopleurae, black. Legs 

 coloured like the body, but paler, the hinder darker tinted 

 than the anterior. Head densely covered with silvery pubes- 

 cence ; the front with a distinct keel down the middle ; 

 except at the ocelli the front and vertex are dark rufo-testace- 

 ous. Mandibles yellowish to beyond the middle ; the apex 

 black, the part behind it rufo-testaceous. Antenual plate 

 stout, roundly narrowed in the middle ; there is no transverse 

 keel below it. Scutellar furrow irregularly crenulated. Meta- 

 notal area large ; in its middle are two widely separated keels ; 

 on either side are a few irregular striae. Abdominal petiole 

 curved, thickly nodose at the apex ; it is as long as the follow- 

 ing 2 segments united. Thorax sparsely covered with pale 

 and fuscous hair. The keel bordering the base of the apex of 

 pronotum is narrow, and is thinner in the middle than at the 

 sides. Basal two segments of antennae pale yellow, the others 

 black, brownish below. Wings hyaline, highly iridescent, the 

 stigma and nervures dark fuscous. 9 . 



Length 8 mm. 



Kuching. November 13th. 



There may be a black mark in the middle of the meso- 

 notum, forming a triangle with the basal pair. Ocelli in a 

 triangle, the hinder bordered by a furrow on the outer side 

 and separated from the eyes by a distinctly greater distance 

 than they are from each other. Sides of pronotum at base 

 round ly narrowed . 



There are now three species of Mellinus known from 

 Borneo. They may be separated thus : 



Thorax black ; the head and thorax covered with gold- 

 en pubescence ; the inetanotal area not clearly 

 defined ... ... ... crabriformis, 8m. 



(b.) Thorax testaceous, marked with black : the pubescence 

 on the head and thorax silvery ; the metanotal area 

 clearly defined, depressed. 



Mesonotum with 3 large black lines ; the head black, 

 entirely, the collar transverse, the sides not nar- 

 rowed, a transverse keel on the face below the 



antennee ... ... ... nigrolineatus. 



Jour. Straita Branch, 



