190 NEW GENERA AND SPECIES 



genus it is so much enlarged as to appear more like a supple- 

 mental mandible, being more than one-third of the size of the 

 real mandible. The niaxillne are singular, the two terminal 

 lobes being greatly elongate, the external very slender, with 

 a few setae at the tip; the internal curved, and acute at the tip, 

 horny, with the inner margin finely denticulated, from the 

 middle to the tip. The maxillary palpi appear only two- 

 jointed, but by carefully examining the maxilla, the minute 

 basal joint is discovered ; the terminal fourth joint, which in 

 many of the Brachelytra is minute and conical, is here entirely 

 evanescent. The mentum is transverse, rather narrowed in 

 front) with the anterior margin straight, the angles produced 

 into two long filaments, sparingly clothed with long setae ; two 

 very long setae also arise near the centre of the front margin. 

 The labium is membranaceous, apparently capable of retrac- 

 tion, and oblong in its form, seeming to be divided by a suture 

 across the middle, its anterior angles produced into two very 

 long and setaceous filaments, longer than the mandibles. The 

 labial palpi are entirely evanescent. The four anterior tarsi 

 are only four-jointed ; the two posterior five-jointed ; the un- 

 gues very long, slender, and slightly curved, with a curved 

 seta on the underside. The antennae have the basal joint 

 small and rounded, the second elongate. 



"In Deinopsis the mandibles are very acute, and incurved 

 at the tip, with two strong and acute teeth on the inside, 

 beneath the apex. The internal lobe of Centroglossa is here 

 replaced by a large appendage, extending from the base above 

 the lowest of the teeth of the mandible, and armed along its 

 inner margin with very acute and deflexed teeth, forming, in 

 conjunction with the toothed mandible, a most effective instru- 

 ment for laceration. The maxillae also participate in this 

 character ; the inner lobe, although very slender, being exceed- 

 ingly acute at the tip, with several sharp teeth on the inside, 

 beyond the middle, and extending to the tip; the long and 

 slender outer lobe is also furnished at its apex with a series of 

 acute and strong bristles. The maxillary palpi are similar in 

 their general structure to those of Centroglossa. The mentum 

 is large, transverse, broadest at the base, with the anterior 

 margin nearly straight, the anterior angles being slightly 

 porrected. The labium is membranous, somewhat quadrate, 

 rather narrowed in front, with a deep notch in the centre of 



