16 U.S. NATIONAL MUSEUM BULLETIN 248 posthumous 



Menacanthus exsanguis malherbi, new subspecies 

 Figures v.7,b,8,b 



Types, cf and 9 adults, from Phloeoceastes melanoleucus malherbi (G. R. 

 Gray), collected by the author at Rio Jurubida, Dept. Choco, Colombia, 

 Mar. 26, 1951. Type in USNM. 



Diagnosis : Head wider at frons and temples ; sides of frons slightly flat- 

 tened (not circular) and temples narrower (longitudinally); a medium 

 long seta, instead of short spine, following two long setae in anterolateral 

 angle; eight spines on lateral margin of pterothorax instead of four in 

 exsanguis exsanguis. 



Both sexes larger in nearly all measurements (see table) ; setae in angles 

 of abdominal segments I-V shorter than in e. exsanguis. Male genitalia very 

 distinctive (see fig. 8,^). Species represented by the 9 holotype, d^ 

 allotype, and 1 cT paratype. Measurements follow preceding species. 



Menacanthus extranetts, new species 

 FiGtTRES l:8,a,9,a 



Types, cT and 9 adults, from Phloeoceastes rubricollis trachelopyrus (Mal- 

 herbe), collected by the author at Palmar, Dept. Cochabamba, Bolivia, 

 July 4, 1937. Type in USNM. 



Diagnosis : About the same size as exsanguis exsanguis, but slightly smaller 

 than e. malherbi. Shape of head very different from both, with frons roughly 

 conical, similar to that oi pitius, new species, but the temples are wider and 

 longer, wider than in e. exsanguis. Chaetotaxy of head equal to that of 

 e. exsanguis, with the addition of four short ventral spines back of head spines; 

 both pro- and pterothorax are larger than in e. exsanguis, and the chaetotaxy 

 of both differ, there being 1 1 long and 1 medium setae on each side of 

 prothorax and 9 long setae on each side of pterothorax, with four to five 

 spines on lateral margin. 



Chaetotaxy of abdomen more abundant, with 12-18 long, strong, dorsal 

 setae on posterior margin of tergites, and 12-15 shorter and more slender 

 setae on posterior margin of sternites and also a median row of short setae 

 in addition to the patches of setae on sternites III and IV. Pleurites are 

 entirely ventral, well defined and heavily pigmented and divided from 

 sternites by a narrow hyaline area, but only outer ends of sternites are 

 visible; terminal sternite with a rather dense fringe of setae on posterior 

 margin. 



Male genitalia very unusual, with parameres constricted medially and 

 expanded distally, with endomeral sac very narrow and with heavy 

 marginal carinae. There is a peculiar sclerite at the base of the endomeral 

 sac of unknown functions, unless it is the movable sclerite, which I doubt. 

 It seems that this sclerite may have been extruded and lost. The heavy. 



