152 Psyche [December 



wings are not developed. The front wings are minute button- 

 shaped discs smaller than the tegulse, while the vestiges of the hind 

 ones are whitish, elongate and longer than the diameter of the 

 tegulse. Some specimens, however, show no trace at all of wings. 



9 (Wingless.) Length 2 mm. Pale brownish-yellow, the 

 last six antennal joints, the extreme base of the first abdominal 

 segment and the tubular last segment of the abdomen, dark fuscous 

 sometimes the sides of the abdomen are infuscated. Head fully 

 one-half longer than wide, its sides parallel, hind angles rounded 

 and the hind margin slightly excavated medially. Eyes one-fifth 

 as long as the side of the head; ocelli indicated but imperfectly 

 formed, the posterior ones only one-half as far from one another as 

 from the anterior ones. xA.ntenn8e about as long as the head, 12- 

 jointed; scape half as long as the width of the head; pedicel as 

 long as the width of the eye, twice as long as thick; flagellum in- 

 creasing in thickness from the base; the first four joints short, 

 particularly the second and third which are strongly transverse; 

 fifth and following, except the last, quadrate-moniliform, increasing 

 in size. Thorax one-fourth longer than the head, slightly con- 

 stricted at the hind angles of the prothorax and base of the propo- 

 deum, the latter widened at apex, with rectangular, slightly 

 rounded angle, mesonotum not attaining the sides of the thorax, 

 nearly twice as wide as long. Abdomen one-half longer than the 

 thorax, broadest near the base and gradually tapering beyond the 

 apex; last segment narrow, tubular, nearly three times as long as 

 wide. Legs stout, but none of the tibiae spinous. 



Port of Spain, Trinidad, B. W. I. 



Described from numerous specimens reared from a Psocid by 

 F. W. Urich, and sent to me several years ago for identification. 



This is a most remarkable species on account of the dimorphic 

 males; in fact, so far as I am aware, it is the first time that such a 

 condition has been found to exist in this or allied families. I took 

 the wingless males at first for females, but from fresh material 

 mounted in balsam, find that some of the apterous individuals 

 are males with the thoracic structure antennae and gential armature 

 of the winged males. The remainder are females with the reduced 

 thorax characteristic of the females of this genus. 



Although the apterous males possess nothing but the most mi- 



