On a new Species of Gerrididas. 177 



XXVII. — Description of a new Species o/'Gerrididie. 

 By Dr. G. Horvath. 



Ilygrotrechus Distantly sp. n. 



Supra niger, opacus, subtus dense argenteo-sericeus, subnitidus ; 

 vertice macula parva transversa basali aurantiaca notato ; rostro 

 apicem rnesosterni vix attingente, toto nigro ; antennis nigris, 

 articulo primo articulis tribus apicalibus siniul sumtis vix breviore, 

 articulis secundo et quarto longitudine aequalibus, articulo tertio 

 articulo pmecedente 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 

 nietanoti baud ( S ) vel vix ($ ) attingentibus, lanceolatis, limbo 

 externo basia versus nigricante ; dorso abdominis liuea mediaua 

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

 sterno, parte inferiore acetabulorum et fulcrorum posteriorum 

 apiceque imo coxarum posteriorum albido-testaceis ; pedibus 

 nigris, femoribus intermediis f'emoribus posticis longitudine sub- 

 sequalibus, tibiis et tarsis posticis simul sumtis tibiis intermediis 

 paullo longioribus, articulo primo tarsorum anticorum articulo 

 secundo vix breviore ; spinis apicalibus segmenti sexti abdominis 

 gracilibus, acutissimis, nigris, nitidis. 

 S . Meso- et metasterno vitta mediana angusta fusca signato ; spinis 

 apicalibus segmenti sexti abdominis segmento genitali primo | 

 brevioribus; segmentis ventrali sexto et genitali primo postice 

 flavo-limbatis ; segmento ventrali sexto postice emarginato, 

 emarginatura medio profunde rotundato-sinuata ; segmento geni- 

 tali primo subtus trifoveolato, foveolis duabus lateralibus mediis 

 et foveola antica in emarginatura mediana segmenti ventralis 

 sexti sita sat profuudis, inter se cannula trifida discretis. Long. 

 11| mill. 

 2 . Spinis apicalibus segmenti sexti abdominis segmentum genitale 

 primum fere dimidio superantibus ; limbo postico segmenti ven- 

 tralis sexti segmentoque genitali primo subtus flavo-testaceis ; illo 

 postice rotundato-emarginato, hoc utrinque prope basin leviter 

 impresso. Long. 13i-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. 



