CHAMBERLIN : HENICOPIDAE OF AMERICA NORTH OF MEXICO. 35 



ZYGETHOBIUS PONTIS Chamberlin. 

 Ann. Ent. soc. America, 1911, 4, p. 34. 



DIAGNOSIS. Dorsum chestnut with a narrow longitudinal stripe 

 blackish; first segment darker; head deep or blackish brown; legs 

 brown, paler proxknally, excepting last pairs which are darker, being 

 blackish proximally and pale distad. Head subrotund, widest caudad 

 of middle. Body robust; but seven times longer than width of tenth 

 plate; strongly narrowed cephalad and more abruptly caudad as 

 usual. Antennae very long; articles 43; those articles distad of the 

 fourteenth more loosely joined with the usual occurrence of shorter 

 articles in pairs excepting among the last four which are all long. 

 Teeth of prosternum 3+3. Posterior angles of sixth, seventh, ninth, 

 eleventh, and thirteenth dorsal plates produced, those of the seventh 

 least so. Coxal pores circular, small; 3, 3, 4, 4, 4. Legs long and 

 especially slender distad ; tibial process present and well developed on 

 all fifteen pairs of legs. 



DESCRIPTION. Dorsum chestnut in color with a narrow longitudi- 

 nal median stripe blackish; first segment darker than the others. 

 Head deep or often blackish brown. Prehensors, prosternum, and 

 antennae reddish, the last mentioned becoming pale, yellowish distad. 

 Venter yellowish to light brown, with the more caudal plates reddish. 

 Legs brown, paler proximally than distally; last pairs of legs darker, 

 blackish proximally, pale distad. 



Robust, being but seven times longer than the width of the tenth 

 dorsal plate. Strongly narrowed cephalad and caudad of the tenth 

 dorsal plate, the first segment being conspicuously narrow. Clothed 

 sparsely with coarse longer hairs and shorter finer ones, the longer 

 ones occurring chiefly along edges of dorsal plates and on the head 

 as spinescent bristles conspicuous among the shorter ones; antennae 

 subdensely clothed with straight hairs and finer shorter ones that are 

 bent or curled at their tips; legs as usual more densely clothed than 

 body. 



Head subrotund; widest a little caudad of the middle, the sides 

 caudad of this being nearly straight and converging to the rounded 

 caudad corners; the longer anterior portion of head conspicuously 

 narrowed; anterior margin between antennae straight or mesally a 

 little indented. Head elevated; marked with a transverse furrow or 

 constriction along or a little caudad of the suture, each end of the 

 furrow being in front of the corresponding ocellus; a v-shaped impres- 

 sion consisting of two furrows diverging from a common point cephalad 



