Genera and Species o/'Scolopendridae. 55 



correctly described t\\Q. figure as being furnished with a single 

 eye on each side, and on the strength of this statement Gervais 

 established the genus Monops for the reception of the species. 

 But there is not a particle of evidence that the specimen from 

 which the figure was taken was provided with only one eye. 

 The drawing which justified Newport in making mention of 

 the eyes at all is the one above referred to of the underside of 

 the head. But, when viewed from this aspect, all the four 

 eyes of a Scolopendrid cannot be seen. Only two are visible, 

 and these, when examined carelessly with the naked eye or 

 even with a lens of low power, appear as a single black patch ; 

 and that General Hardwicke, when painting this figure, did 

 make only the most superficial examination of his specimen, 

 is shown by the manner in which he drew parts so conspicu- 

 ous as the maxillary feet. 



Furthermore, that the specimen did not belong to the 

 CryiJtops group is clearly manifested by an enlarged drawing 

 that is given of one of the legs. This shows that the tarso- 

 metatarsus was composed of two distinct segments, of which 

 the distal is much shorter than the proximal. In Cryptops 

 and its allies the tarso-metatarsus is undivided, except in the 

 case of tlie posterior two pairs of legs. But when they are 

 divided the segments are subequal in length and not mani- 

 festly unequal, as in this Monops niger. 



In conclusion, I may add that, after carefully examining 

 the figure, I have no doubt that it was taken from some speci- 

 men either of Otostigma or Rhysida ; but since this is a point 

 which will probably never be definitely settled, and considering, 

 too, the circumstances under which the genus was established, 

 I have thought it superfluous to introduce Monops into the 

 accompanying key of genera. 



Descr{p)lions of new Species. 



Heterostoma longicaiida, sp. n. (PI. IV. figs. 1-1 h.) 

 Heterostoma longicauda, Newport, MS. 



Body robust; widest at the fourteenth tergite, from the 

 fourteenth narrowed posteriorly to the twenty-first and ante- 

 riorly to the fourth, the first very wide. 



Colour deep reddish brown, the posterior margin of the 

 tergites with a greenish or ochraceous tinge ; legs and an- 

 tennae ochraceous; shining. 



Head-jjlate cordate, smooth, very finely punctured. 



Anttnnai moderately long, composed of twenty segments, 

 whereof the basal four arc bare, tiie rest pubescent. 



