182 Psyche _ [December 
Described from a series found in several colonies of Formica 
subcyanea Wheeler about Velasco and near Guerrero Mill. This 
is the second American species of Hemilexis as defined by Kieffer 
(Gen. Ins. Fasc. 124, p. 20, 1911), and differs widely from the 
other, H. californica Ashmead. Nothing is known regarding the 
habits of the other species, but jessei and the following variety are 
undoubtedly closely associated with the ants, probably as parasites 
on the immature phases. Only one or two individuals were 
found in each nest. They moved about rather slowly among the 
ants, which paid no attention to them. 
This species is dedicated to my small collecting companion, 
Master Jesse Van Law. 
Hemilexis jessei var. minor var. nov. 
Three females which were taken in the same locality and with 
the same host ant as the preceding form seem to belong to a distinct 
variety. The size is much smaller (length 1.75 mm.) than in the 
typical form, and the coloration is lighter. The prothoracic 
pleurz, scutellum and petiole being light fuscus. Otherwise the 
two forms are identical. 
Family BerHyLip®. 
Bruesiella gen. nov. 
Female. Apterous. Head transverse, broader than thorax; face evenly rounded, 
smooth except small foveze at apex. Antenne 12-jointed, the basal joint much 
enlarged; inserted at base of clypeus; narrowly separated at base. Mandibles 
stout, thickened at tips. Eyes well developed, oval, flat. Ocelli absent. Pro- 
thorax transverse, smooth, with a single large puncture near a feeble longitudinal 
impression at margin. Mesothorax transverse, the pleurz extended into a thick, 
nearly perpendicular lamina. _Metanotum from above subquadrate, broadest 
behind, sides feebly, irregularly margined; the posterior border with an acute, 
interrupted carina. Scutellum absent. Abdomen slender, somewhat depressed. 
Legs short, stout, the middle and posterior femora swollen, flattened; tibize spinose, 
the middle more strongly than the others. 
This genus runs out at Sclerochroa in Kieffer’s table in the Genera Insectorum. 
(Fascicle 76, p. 10, 1908). The peculiar structure of the mesothorax is quite 
different from that in any other of the described allied genera. In general appear- 
ance it bears considerable resemblance to some of the Thynnide. 
Type: Bruesiella formicaria sp. nov. 
Bruesiella formicaria sp. nov. 
Female: (Fig. 4). Length 3.5 mm. Body shining. Head, thorax, anterior 
portion of first abdominal segment and legs brown, remainder of abdomen black. 
