438 Timehri.. 
the semi-circular keel bordering the area is weakly irregularly crenulated ; 
there is an area in the centre of the apical slope : its keels are weaker above and 
roundly converge there ; there is a large longish oval in the centre ; there are 
some weak striz on the inner side of the apical half of the keels. The furrow 
on the base of the mesopleure is strongly crenulated on the lower half; shortly — 
beyond it is a wider, more irregular, having at the top 3 keels which extena to 
the zpex of the propleura ; there is a large, pyriform fovea in the centre of the 
mesopleure, the apical furrow of which is crenulated. Female. 
Length 6 mm. 
Ocelli in a curve, the hinder separated from each other by a greater distance 
than they are from the eyes. A keel runs down rom the ocelli to the frontal 
area, which is bordered above by a rounded keel. 
TRYPOXYLON, Latr. 
Trypoxylon albitarse, Fab. 
Syst. Piez. 180, i, Lepelletier, Hist. Nat. Ins. Hymen, iv., 228; Saussure, 
Reise Novara, Hymen. 77. 
Both the examples have the mandibles red—var. mexicanum, Saussure, Lc. 
They were given me by the Rev. Mr. Harper from Demerara. 
Trypoxylon palliditarse, Saussure, l.e 77. 
The pubescence in this species is grey or whitish, not fuscous as in albitarse. 
In size it varies from 17 mm. (male) to 22 m. (female). 
Trypoxylon aztecum, Saus. 
Reise Novara, Hymen., 80. A specimen with only the basal segment of the 
abdomen present is very probably this species. 
Trypoxylon latiornatum, sp.n. 
Black, densely covered with golden pile and the head and thorax with pale 
hair, the basal 4 joints of the flagellum, a longitudinal line, 4 times longer than 
wide, down the middle of the 1st abdominal segment, commencing at the 
spiracles and reaching to the base of the apical third, the basal two-thirds 
of the 2nd segment, the black apical band dilated in the middle, the base of 
the 3rd narrowly, and the ventral surface of the basal 2 rufo-testaceous, the 
apices of the other segments narrowly of a paler testaceous colour ; the knees, 
the 4 anterior tibiew and the basal half of the hinder behind rufo-testaceous ; 
the tarsi of a paler testaceous colour, their apical 2 or 3 joints blackish ; the 
spurs testaceous ; wings hyaline, iridescent, the stigma and nervures black ; 
tegule piceous. Female. 
Length 12 mm. 
The pubescence on the face, clypeus and lower part of front is very dense 
and golden. Vertex from the hinder ocelli closely, strongly punctured, more 
or less striated and reticulated ; below the ocelli is a V-shaped area, formed by 
shallow, striated furrows, which unite near the antennw, where they become 
