14 



ture is far from constant. Cameron in dealing with the Central 

 American species has long since allowed considerable variability 

 in the Dyrinidae in most of these respects, and from the fine 

 collections and many bred specimens, I have handled, I can full} 

 confirm his ojiinion. 



Aptcrodryiiius gen. nov. 



General form as in Gonatopus and its allies, mandibles with four 

 teeth, maxillary palpi 6-jointed, labial 3-jointed. Pronotum dis- 

 tinctly emarginate in front, no distinct transverse impression or 

 constriction, strongly compressed into an acute raised median 

 carina posteriorly ; mesopleura forming a raised outstanding line 

 separating them from the propodeum. Fourth tarsal joint of front 

 legs, about as long as the first ; fifth seen in profile nearly parallel 

 sided for the most part, very little curved on the lower edge, chelar 

 claw with a regular row of distmct spinules (not lamellate) 

 reaching well beyond the mliddle from the base and with a very 

 distinct anteapical tooth. This genus is a derivative of some such 

 winged form as I have called Neodryinns, the thorax becoming 

 modified, as in the other wingless forms included in Gonatopus s. I. 



Aptcrodryiiius iorz-us n. sp. 



Black, the front of the scape and the mandibles except the teeth, 

 white ; the clypeus round the margins, sometimes a mark above 

 this, usually a broad line along the inner orbits, which bears dense 

 silvery pubescence, yellowish or brownish yellow ; apical two joints 

 of antennae generally clear testaceous or yellow, sometimes only 

 the apical joint pale, sometimes one or more of those preceding 

 the two apical ones are pale, thougii generally more or less sordid, 

 but the three last may be corcolorous. Tarsi brown, rarely dark 

 brown, stalk of anterior trochanters sometimes pale, posterior 

 femora sometimes with the thin apical part except at the tiji 

 yellow, sometimes obscurely pale, or entirely black. 



Head moderately strongly transverse, evidently concave above 

 between the eyes, very densely evenly punctate, or shagreened, 

 antennae decidedly slenderer in some examples than in others, in 

 one, carefully measured, the third joint was one and two-thirds 

 the length of the fourth, the latter rather more than three times 

 as long as its greatest width. Pronotum sculptured like the head, 

 smooth in front of the middle about its lateral margins ; propo- 

 deum in profile strongly rounded, but not at all abruptly raised, 



