NO. 1563. SOME EARWIGS FROM GUATEMALA— CAUDELL. 171 



Length. — Body, without forceps, 7.5 mui. ; forceps 2 mm. 



Type-specimen. —Cfit. No. 10365, U.S.N.M. 



The posteriorly broader pronotiim and the obscurely laterally folded 

 abdomen is not in full accord with characters given for the genus 

 Cylindi'()gasfei\ inclining rather to Dqdatyx.. Other characters, how- 

 eyer, haye led me to place it here. 



"In company with ImVui cdrnoeimii." 



PYRAGRA CHONTALIA Scudder. 



"One male, one immature female, taken onto steamer wit! i firewood. Polochic 

 Kiver, below mouth of C'ahabon River, 3Iareh 22." 



ARTHRCEDETUS, new genus. 



Description. — Female, unknown. Male, head convex aboye; anten- 

 nae of more than 19 segments," the basal segment moderatel}- large 

 and somewhat enlarged aj^icall}', scarcely longer than the greatest 

 width; secoiid segment smaller than the basal one and about one- 

 third as long; third segment yer}^ long, being almost twice as long as 

 the basal one and mesially about as thick; fourth segment about the 

 same length as the second, scarcely as long as broad ; the next four or 

 tiye segments are about as long as broad, l)eyond them the segments 

 gradually grow more elongate, the nineteenth being about four times 

 as long as broad. Pronotum no longer than broad, no broader than 

 the head. P^lytra and wings absent. Abdomen elongate, scarcely 

 broadened mesially and moderately, conyex, without lateral folds, the 

 last dorsal segment slightly' transverse. Legs moderateh^ stout, the 

 second tarsal segment small and simple, the first and third subequal in 

 length, no arolium visible between the claws. Forceps of moderate 

 length and simple, sulicontiguous basally. 



This genus is allied to Echinopsalis., l)ut the antennal segments are 

 somewhat different from those of the ty^^ of that genus, more like 

 those of Rehn's E. hrev/hractea. Arthrcpdetns^ morever, is apterous. 



Type of the genus. — ArthriPcIetus Jxirheri. 



ARTHRCEDETUS BARBERI, new species. 



One male, Polochi:; River, May 2. 



Description. — Of moderate large size; general color almost uni- 

 formly light ])rown above, somewhat lighter l)elovy. Head slightlj^ 

 darker al)Ove than the rest of the body and with a distinct transverse 

 occipital line, and from the center of this line a longitudinal depressed 

 line extends to the hind margin where it meets the anterior end of a 

 deep and distinct median sulcus which extends the entire length of the 

 pronotum and obsoletely on over the meso- and metanotum. Pronotum 



"The antenna' of the only specimen known are imperfect. 



