1920] Brues — A Dimorphic Species of Cephalonomia from Trinidad 151 



A DIMORPHIC SPECIES OF CEPHALONOMIA FROM 



TRINIDAD. 



By Charles T. Brues, 

 Bussey Institution, Harvard University. 



Cephalonomia urichi sp. nov. 



Winged d^. Length 1.6 mm. Pale honey -y ellow ; flagelhun of 

 antennae piceous ; tips of mandibles black, a rounded spot at base 

 of first abdominal segment piceous, second segment near the mid- 

 dle with a transverse piceous band which is narrowed laterally and 

 emarginate medially, third and fourth segment each with a similar 

 band nearer the base, fifth segment with band narrowly indicated 

 at the sides. Head one-third longer than wide, minutely scabrous, 

 eyes one-third as long as the head, exclusive of mandibles; ocelli 

 very distinct, in an equilateral triangle; head between antennae 

 with a short carina; antennae 12-jointed, scape as long as the eye, 

 pedicel one-half as long as the scape and nearly three times as long 

 as thick, basal joints of flagellum quadrate-moniliform, apical 

 ones longer, the penultimate joint one-third longer than thick, 

 last joint twice as long as thick. Pro- and mesothorax and scutel- 

 lum shining, faintly scabrous. Prothorax one-half longer than the 

 mesonotum, narrowed anteriorly; mesonotum transverse, nearly 

 twice as wide as long, without parapsidal furrows, but with a broad 

 impressed longitudinal groove on each side next to tegulae; scutel- 

 lum large and distinct, oval and but slightly elevated, separated 

 from the mesonotum by a narrow impressed line; at each side of 

 the scutellum is a rounded impression which extends to the tegulse 

 which are large. Wings hyline to almost the middle, distinctly 

 infuscated beyond. Subcostal vein one-third the length of the wing 

 ending in a large, pale brown stigma. Base of propodeum very 

 minutely roughened, middle portion with coarser, but less deeply 

 impressed reticulations, apically almost smooth; the lateral margins 

 are Aveakly carinate and the posterior edge forms a sharply rounded 

 edge, but there are no discal carinse. Abdomen smooth, rather 

 shining, about as long as the thorax. Legs rather stout, especially 

 the anterior femora; the tibiae not spinous, tarsal claws slender, 

 simple. 



Wingless cf . This form seems to be identical, except that the 



