On a new Species of Gerrididfe. 177 



XXVII. — Description of a neio Species o/Gerridid.e. 

 By Dr. G. IIorvath. 



Ilycjrotrechus Distanti^ sp. n. 



Supra niger, opacus, subtus dense argentoo-sericeus, subiiitidus ; 

 vertice macula parva transversa basali aurantiaca notato ; rostro 

 apicem mesosterni vix attingente, toto nigro ; antennis nigris, 

 articulo primo articulis tribus apicalibus simul sumtis vix breviore, 

 artieulis secundo et quarto longitudine jequalibus, articulo tertio 

 articulo prtecedente fere \ breviore ; pronoto capite quadruplo 

 longiore, lineola longitudinali lobi antici marginibusque lateralibus 

 et postico lobi postici aurautiacis, lobo postico transversim sub- 

 rugoso; hemelytris rudimentariis, fortiter abbreviatis, apicem 

 metanoti baud ( cJ ) vel vix (§ ) attingentibus, lanceolatis, limbo 

 externo basin versus nigricante ; dorso abdominis linea mediana 

 percurrente, interdum sat obsoleta, argenteo-sericea ornato ; pro- 

 sterno, parte inferiore acetabulorum et fulcrorum posteriorum 

 apiceque imo coxarum posteriorum albido-testaeeis ; pedibas 

 nigris, femoribus intermediis femoribus posticis longitudine sub- 

 aequalibus, tibiis et tarsis posticis simul sumtis tibiis intermediis 

 paullo longioribus, articulo prirao tarsorum auticorum articulo 

 secundo vix breviore ; spinis apicalibus segmenti sexti abdominis 

 gracilibus, acutissimis, nigris, nitidis. 

 (S . Meso- et metasterno vitta raediana angusta fusca siguato ; spinis 

 apicalibus segmenti sexti abdominis segmento genitali primo \ 

 brevioribus ; segmentis ventrali sexto et genitali primo postice 

 flavo-limbalis ; segmento ventrali sexto postice emarginato, 

 omarginatura medio profuude rotundato-sinuata ; segmento geni- 

 tali primo subtus trifoveolato, foveolis duabus lateralibus mediis 

 et foveola antica in emarginatura mediana segmenti ventralis 

 sexti sita sat profundis, inter se carinula trifida discretis. Long. 

 Hi mill. 

 5 . Spinis apicalibus segmenti sexti abdominis segmentum genitale 

 primum fere dimidio superantibus ; limbo postico segmenti ven- 

 tralis sexti segmentoque genitali primo subtus liavo-testaceis ; illo 

 postice rotundato-emarginato, hoc utrinque prope basin leviter 

 impresso. Long. 13|-14 mill. 



Hah. Nyasaland, Fort Johnston. 



This fine species, three specimens of which Mr. W. L. 

 Distant has submitted to me for identification, differs from the 

 other species of the genus by the yellow- margined pronotum, 

 the orange-yellow rudimentary elytra, and the two joints of 

 the anterior tarsi subequal in length. 



