192 Notes on the Morpholofm of Chalcidoidea 
that we have more than one European species, and I venture to think 
that M. osmiae, Thoms., d, 1878 {Hym. Scandin., Vol. v, p. 204), is 
merely a synonym of M. acasta. 
In the figure of the radius (Fig. 1, e) the dotted hair is present in 
a number of specimens. The pigmentation of the rudimentary lateral 
eyes of the d is often, in life at least, quite pronounced. The figure 
of the d antenna (Fig. 2, c) is designed to show the inward bend of the 
funicle from the second joint (dotted) onwards. 
Melittohia acasta Walker (1839). 
$. Head. Longer than broad (14 : 13); eyes, \ of the total depth, separated by 
3 diameters across the middle of thefrons; in profile small. Vertex extending 
distinctly above the eyes while below the malar space is nearly | of the eye’s 
depth. Malar keel marked, forming with the clypeal edge a rounded angle. 
Two large rounded median clypeal lobes not widely separated. Ocelli nearer 
to one another than to the orbits, the anterior one well above the eyes. 
Reticulation of vertex and frons consisting of rather large feebly raised 
cells, which are more elongate on genae and occiput. Scrobes small, quadrate, 
corners rounded, narrower superiorly, set far down on the face, halfway between 
base line of the eyes and mouth edge, and rather wide apart. There is a nearly 
smooth broad triangular supra-clypeal area contracting to its narrowest in the 
middle of the frons just above the base line of the eye, from which point the 
smooth siuface continues upwards as a narrow groove whose sides diverge very 
gradually towards the anterior ocellus. Eyes practically bare, not more than a 
few very short scattered bristles being visible under high magnification, 8-10 
short bristles along each orbit. Face and verte.x with numerous bristles—about 
40 (not counting the orbital bristles) on each side of the median depression, 
8 (4, 4) between the scrobes and 2-3 on each clypeal lobe. 
Antennae. Length 0-45 mm., scape, pedicel, ring-joint (compound), 3 in funicle, 3 in 
club. Scape (4: 1 at apex) narrow at base and gradually expanded, about as long 
as the three normal funicular joints and the first segment of the club together, 
many short external bristles, 9-12 crossing the ventral edge, and about the 
same dorsaUy. On inner apical half 8-10 bristles, and 2 stronger subapically 
above the hollow for the reception of the pedicel. Pedicel (5: 3) of the 
scape. Ring joint narrow, a little more than \ the width of the pedicel, with 
2 joints each of which consists of 2 closely appressed laminae, whose distinctness 
can be demonstrated by pressure. Funicular joints subequal (14:14:15) 
increasing in width (15 : 17 : 18). The club (11 : 5) (as long or nearly so as the 
3 normal funicular joints together) segmented in ratio 17 : 14 : 13, with terminal 
spur giving rise to a spine. The short “mushroom’’-like truncated bristles of 
the funicle, 1-2 on each joint, rise from large pustules. Sensoria few, broad, 
moderately raised but without long points, except on the 3rd division of the 
club, arranged as follows [a) 3, (6) 4, (c) 4, (d) club 4-5 : 4-6: 3. 
Mouth parts. Mandible somewhat long, tridentate, the outermost (lowest) and 
middle teeth acute, the former longer; the third tooth small, rounded— 
