1915.1 15 



Menacanthits Neumann. 



Menacanthus balfouri sp. n. 



A pale form with no definite markinors. 



c? . Head. About twice as broad as long. On the ventral aspect on each 

 side of the median line are : 1 short hair behind the mandible, 1 longer opposite 

 the middle of the heavy spine, and 3 in a row alongside the spine. Near the 

 inferior edge of the occiput are two long hairs (see fig. 1). There are 4-5 long 

 hairs superiorly on the temples, and 4 along the occiput. 



Thorax. Pronotum almost bare, a short spine well inside the lateral angle, 

 where there ai'e a spine on each side with a long bristle between them ; 11 strong 

 long bristles on posterior edge. Meso-metathorax short — nearly spanned by 

 the long bristles of the pi'onotum. Metanotum with 2 short spines on the sur- 

 face, on each side, near the edge. 



Owing to the crop tlie exast outline of tlie metathorax over the abdomen 

 cannot be determined. It appears to be somewhat convex. At the postero- 

 lateral angles 2 spurs, and thereafter a straight row of long bristles, about 12, 

 with a spine between the 2nd and 3rd on each side. These long bristles span 

 tergites 1 and 2. No bristles between the fore-coxae, but on each, near the inner 

 angle, is a conspicuous pair. 6 bristles between the mid-coxae and rather more 

 behind the meta-coxae. 



Abdomen. Oval, with sub-equal tergites, 1 and 2 being a little shorter than 

 the others. Each bears a simple transverse posterior row of hairs which are 

 stronger and longer on the hind segments. The rows increase from 12 to 18 

 (3rd segment), after which they decrease again. At the sides of the anterior 

 tergites are a few short spines. On tergites 7-8 the row is sparse medianly. 

 The 9th tergite bears posteriorly a pencil of 14 hairs — the outermost being 

 strongest. 



The pleurites bear from 3-6 bristles or haii-s. The sternites have two rows 

 of hairs neither of which is qviite continuous mesially. At the sides also one or 

 two additional short bristles occur. 



Genitalia. Basal plate exceedingly long and slender, expanded and rounded 

 proximally. Paramera elongate, finely and gradually pointed. Mesosome 

 oblong. The endomera ending obliquely. Telomera reduced to a chitinous 

 edging of the long, slightly roughened sac. (fig. 2a). 



MEASUEEMENTS. S . 



Length. Breadtli. 



Head 31 58 



Prothorax 23 43 



Mesothorax 19 ; 49 



Abdomen 1.15 79 (4 and 5) 



Total 1.88 mm. 



