716 PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIII. 



Head from If to 1| times as wide as it is long; widest across the 

 eyes, very slightly narrowed behind ; square in front. Vertex slightly 

 elevated between the bases of the antennae. A rather conspicuous 

 ridge runs transversely across the back of the head at some distance 

 behind the eyes. There are, besides this, a few other similar but 

 much less conspicuous ridges running parallel with it on the same 

 general part of the head. Eyes large (occupying together about two- 

 thirds the width of the head), conspicuous and with a slight tendency 

 to protrude. Ocelli fully as large as the facets of the eye, and well 

 separated; the two posterior ones almost touching the margins of 

 the eyes; yellow in color and bordered Avith dark reddish crescents. 

 Cheeks nearly straight, bulging but slightly. Spines between ocelli 

 on each side long and conspicuous; ]Dost ocular spines shorter but yet 

 very prominent. Face (ventral view of head, fig. 5) Avith a large 

 and conspicuous spine on each side of the middle at some distance 

 behind the eyes also with a rather conspicuous pair, the two nearer 

 the middle line especially so, between the eyes and placed at some 

 distance back from the bases of the antenna?. On each side of the 

 head, behind the eye, there is also a rather noticeable spine. On each 

 side, in front of the anterior ocellus, there is a small but characteris- 

 tic spine. There are other spines on the head, both above and below, 

 but these are the most remarkable. Mouth cone pointed and rather 

 slender, reaching back two-thirds across the prosternum; maxillary 

 palpi three segmented, the basal segment being fully tAvice as thick 

 as the apical one. Antennae about as long as the head and prothorax 

 taken together, inserted a little beloAA^ the margin, their bases sep- 

 arated by little more than one-fourth the thickness of the basal 

 segment; relative lengths of segments as folloAvs: 



Number of segment _ 12 3 45678 



Spaces of micrometer covering it 9.5 18.8 20.3 19.9 15 20 4.7 5.1 



The three basal segments thickest, the first being thicker than the 

 second and the second thicker than the third; fifth and sixth sub- 

 equal. First segment rounded conical in form, somewhat thicker 

 than long; second cup-shaped, the third and fourth fusiform. Spines 

 on the antennae for the most part quite strong and conspicuous, dark 

 colored. Sense organs Avell developed; cones on segments three and 

 four forked. Color of segment one and two brown; three and four 

 yellow, four slightly tinged Avith broAvn on its apical half ; five yellow 

 at base, light grayish brown at apex; six, seven, and eight grayish 

 broAvn. 



Prothorax rounded, one and one-half times as broad as long ; about 

 one and one-fourth times as wide as the head ; from 1.15 to 1.3 times as 

 long as the head : bearing a pair of long stout spines at each angle of 

 the notum ; also one short anteriorly directed spine standing close to 



