THE MYRTAPODA CF NORTH AMERICA. 179 



anteriorly not emarginate, sparsely irregularly punctate ; lateral margins arcuate ; antennae rather long, very pilose ; 

 labium sparsely irregularly punctate, medianly canaliculate, anteriorly emarginate; feet long, yellowish, pilose, on 

 each side 48; scuto-episcutal sutures conspicuous; ventral surface anteriorly orange, posteriorly deep olive; sterna 

 impressed with sterno-episternal sutures and a median depression. 



G. cephalicus, Wotid, Joum. A. N. S., new series, vol. v, 1863, p. 44. 



The body is very wide, as is also the head ; the prebasilar segment of the latter is very 

 strongly widened posteriorly. The mandibles have on the inner side one or two exces- 

 sively minute denticulations. The anterior portion of the body is a dilute orange, but a 

 short distance from the head a dark stripe commences, which, gradually widening, soon 

 involves the whole surface in a very dark olive tint. The scuta are uneven and variously 

 wrinkled. This form differs from the following in having the head very much broader, 

 and the cephalic segment not emarginate anteriorly ; the labium much more deeply canali- 

 culate, and the number of segments not so great. Still it is possible that the differences 

 are only sexual, and, having but one specimen of each, I cannot decide this point. The 

 creature was caught near Philadelphia by my friend, Dr. Horn. I append a descrip- 

 tion of what may be the female of this species. 



G. ? G. saturate aurantiacus, robustus, politus; capite parvo; segmento cephalico parvo, antice leviter 



emarginato, marginibus lateralibus rotundatis ; antennis modice longis, proximis pilosis, ultimis fere pubescentibus ; 

 mandibulis parvis, indistinetissime trideutatis; labio medio leviter canaliculato, antice leviter emarginato, sparse 

 subprofunde punctata; pedibus brevibus, sparsissime pilosis, utrinque 51. 



Deep orange, robust, polished; head small, cephalic segment small, anteriorly lightly emarginate, lateral mar- 

 gins rounded; antennas rather long, prosimally pilose, distally almost pubescent; mandibles small, very indis- 

 tinctly tridentate; labium medianly lightly canaliculate, anteriorly lightly emarginate, sparsely subprofoundly 

 punctate; feet short, very sparsely pilose, 51 on each side. 



The sterno-episternal sutures are well marked, but not as deeply as the scuto-episcutal. 

 The surface of most of the scuta is quite uneven, sometimes almost coarsely rugose. 

 The dorsum has a very indistinct dark median stripe, more apparent on the posterior por- 

 tion. Length, II inches. 



Hob. Cumberland, Md. — Smithsonian Collection. 



G. BREVICORNIS. 



G. saturate aurantiacus, robustus, venuste politus; capite aurantiaco; segmento cephalico parvo, sparse subpro- 

 funde punctato; antennis pilosis, brevibus; mandibulis sparsissime pilosis, indistincte quadridentatis, singula 

 denticulo unico (interdum duobus) modice magno; labio subprofunde punctato, antice emarginato, medio canali- 

 culato; pedibus compressis, utrinque (? in mare) 55, (? in femina.) ? 



