122 CHAS. T. BRUES. 



in front and yellowish behind. Second and following segments shining piceons, 

 with a few short white hairs, second very narowly reddish posteriorly. Oviposi- 

 tor exceeding tip a little more than length of first abdominal segment. Legs 

 luteous, more or less darkened on the coxse, femora and tibiae. 



Described from a female specimen collected in nest of Leptothorax 

 longispinosus Roger. P. maculicollis is readily recognized by its 

 small size and by the ferruginous markings on the thorax. It evi- 

 dently mimics the ant with which it lives, resembling it greatly in 

 size, color and general habitus. 



I have also a single $ and 9 collected at AVoods Hole, Mass., 

 which belong perhaps to this species. The thoracic spots are very 

 faint in the 9 > which has 20-jointed antennae and more distinct 

 tubercles on the petiole than P. maculicollis. The apterous male 

 has also 20-jointed antenna and a narrow scarcely dilated black 

 petiole. The legs are slightly darker than in the 9 . 



Fezomaclius texauiiM Cress. 



This species occurs at Austin, Texas, associated with the ant So 

 lenopsis geminata Fabr. A male specimen collected by Dr. William 

 M. Wheeler in a nest of the same ant at Corpus Christi, Texas, proves 

 to be wingless. It diners from the female in having the antennae 

 almost as long as the body ; the head entirely honey yellow ; scutel- 

 lum very distinct (it is very faintly separated in the female). The 

 pedicel and whole abdomen, as well is much elongated. The anten- 

 nae are 22-jointed ; they are 21-jointed in the female. 



Var. nigriventris. — Several females from Austin Texas, differ from 

 the typical form in having the head and thorax dark ferruginous, 

 and the whole abdomen behind the petiole shining black. 



Pezomachu* angularis sp. nov. 

 Female. — Length 2.75 mm. Small, slender, black. Tip of petiole and abdomen 

 pale. Head shining, rather densely and finely punctured ; black above, deep 

 yellow in front below the antenna; and below on the cheeks behind. Mandibles 

 and palpi luteous, the former black at the tips. Antennae slightly longer than 

 the body, 22-jointed, yellowish at base and infuscated apically. Thorax slender, 

 the anterior and posterier lobes very nearly equal, the posterior one more strongly 

 arched ; fuscous or piceous brown, lighter on the sides of the pro- and mesothorax. 

 Mesonotum finely punctured, not sulcate. Metathorax more coarsely punctured, 

 especially behind, without any keels. Abdominal petiole with its lateral tubercles 

 very prominent, behind which it is constricted and then widens out to the apex, 

 where it is no wider than at the tubercles. Petiole piceous, paler at base and 

 with a luteous band at apex. Abdomen elongate oval, rather slender, scarcely 

 wider than the head; shining and sparsely finely sericeous pubescent. Second to 



