212 bulletin: museum of comparative zoology. 



ventral border of head at anteroectal end of lateral division and the 

 much shorter coxosternum of the second maxillae and difference in 

 position of pore; the smaller middle piece of the labrum; and the 

 larger clypeus, which extends cephalad in triangular form to near 

 level of antennae. It agrees with the latter genus in the unarmed 

 character of the lateral pieces of the labrum and also in the large size 

 of the membranous lobe of the inner division of the first maxillae. 



Tygarrup intermedius, sp. nov. 



Yellowish; in type with a pale median longitudinal line paralleled 

 or limited on each side by a somewhat darker stripe which is deepest 

 cephalad and caudad, but these not evident in younger specimens. 

 Head and prosternum with prehensors pale ferruginous. Antennae 

 and legs pale. 



Head widest at level of labrum, conspicuously narrowed caudad 

 with posterior corners well rounded; caudal margin straight; sides 

 oblique and somewhat incurved from ends of frontal suture to ectal 

 side of base of antennae; anterior margin substraight, narrowly semi- 

 circularly excised at middle. Longer than wide in ratio 100:73. 

 Pleural piece of ventral side of head plate with mesal edge strongly 

 chitinized and ending cephalad in a pointed process as usual but with 

 no trace of a tooth at cephaloectal angle. Clypeal region with hairs 

 very sparse. Hairs of dorsal surface small and sparse. 



Labrum with the median piece very narrow, the sides of this being 

 for most of length nearly parallel or but little converging caudad, its 

 caudal end narrowing to a subacute tooth. Greatest length of labrum 

 (i. e. at ends) about one third the median length of the clypeal area. 



Inner branch of the first maxillae with basal portion subtriangular 

 in outline; the membranous distal division as long as or nearly as 

 long as the basal, widening distad with mesal side concave and the 

 ectal convex. Outer branch narrow, subcylindric, narrowing but 

 moderately to the beginning of the long membranous distal division 

 which is as long as the proximal division and widens distad like that 

 of the inner division which it overtops by a short distance. 



Coxosternum of second maxillae rather short; median portion 

 membranous; mesocaudal portion also membranous and not sharply 

 defined. Pore close to outer edge, to which a passage from it leads, 

 and a little caudad of middle of length, five or six bristles forming a row 

 parallel with and a little removed from the anterior margin on each 



