336 Natural History Bulletin. 



suture) with three teeth, the middle one large and rounded, 

 the lateral ones smaller and pointed. 



Eyes on a raised black spot, posterior to the antennae. The 

 appearance is of six ocelli, of which four are situated on the 

 upper surface of the head as shown in the figure, while the 

 two larger ones are rather anterior and inferior to them in 

 position. 



Antennae inserted immediately behind the base of the man- 

 dibles, on a tubercle, four-jointed, the first joint short and 

 stout, the second long, third and fourth shorter, the fourth 

 being shorter than the third. There are no bristles. 



Mandibles curved, acute, moderately stout and without 

 teeth, the inner margin showing only a slight roughening 

 even under a one-fifth objective. 



Maxillae very stout and heavy. The first joint is long and 

 heavy, the second joint heavy but much shorter, having three 

 appendages; internally a long slender tooth, notched at tip, 

 externally a long four-jointed palpus of which the first joint is 

 short and the remaining three longer but nearly equal among 

 themselves, though the second is the longest, and between 

 these two appendages is situated a third, two-jointed one. 

 The only bristles visible are two in number and situated at 

 the base of this last-mentioned appendage. 



Mentum. I think I am correct in describing this as small 

 and covered at base by a lobe of the under surface of the 

 head. The palpi are very long, three-jointed, the basal joint 

 stout, the remaining ones more slender. It is possible that 

 what I have described as the basal joint may be a supporting 

 piece, like that found in the larva of OnmsA 



Prothorax narrowed in front and having on the dorsal sur- 

 face a corneous scute, the posterior margin of which is bound- 

 ed by a dark brown line. Disk convex, sides nearly straight, 

 base and apex slightly sinuate. 



Mesothorax somewhat broader than prothorax, narrowing 

 anteriorly from a point quite near the base. 



1 Horn, Trans. Am. Ent. Soc, VII, p. 33. 



