72 
A Parasitic Phorid Fly 
Close to tlie antennal organ, but rather ventral to it, is a minute slightly 
curved and somewhat club-shaped projecting organ; near the latter there is 
also a small group of minute papillae (Text-fig. 2 b and c). 
The first segment of the body is small and rather conical, and near its 
posterior margin is a pair of projecting lateral spiracles which are brown in 
colour. Dorsally this segment bears a slight median transverse depression. 
The remaining segments, except the last, are cylindrical, and increase in 
size to the sixth, after which they are approximately equal in size. The second 
and third segments are each divided dorsally into two parts by a median trans¬ 
verse sulcus. On each of the following segments, from the fourth to the ninth, 
there are three similar sulci. The second and third of the regions so formed in 
each segment are less clearly defined than the first and fourth, and it may be 
added that the third and fourth regions increase slightly in prominence on 
the posterior segments. 
The tenth segment is divided, dorsally, into three regions, of which the 
third is the most conspicuous. 
The terminal segment is in the form of a blunt cone, and is divided dorsally 
into three regions, of which the first is the largest and bears the pair of small 
posterior spiracles laterally. The terminal portion of this segment is rather 
flattened. 
\ entrally, the first segment is undivided; the second segment is very faintly 
divided, and the third segment more distinctly divided into two regions. The 
fourth to tenth segments are divided into three regions, of which the first 
is very slightly the more prominent. 
The terminal segment is similarly divided into three parts, and bears the 
conspicuous aperture of the anus on the foremost division. On each side of 
the anus is a rather prominent rounded fleshy process. 
Buccopharyngeal Armature (Plate III, figs. 4 and 5). The buccopharyngeal 
armature is divided into three parts: (1) the pharyngeal or basal sclerite, 
(2) the intermediate sclerites, and (3) the mandibular sclerite. 
(1) The pharyngeal sclerite is prolonged posteriorly (dorsally and ventrally) 
as a very delicate chitinous structure, the dorsal prolongation being much 
the longer. Its anterior end is strongly chitinised and bears on each side a 
hollow for the articulation of the intermediate sclerite. 
(2) The intermediate sclerites are stout and strongly chitinised and are 
not fused together. They articulate with the hollows at the anterior end of 
the pharyngeal sclerite by means of a hook-like prolongation at their posterior 
end. 
(3) The mandibular sclerite is a single very stout structure. It articulates 
with the intermediate sclerites by means of a pair of backwardly directed • 
divergent arms at its posterior end. Ventrally, near the base, it bears several 
slight transverse ridges suggestive of vestigeal teeth. 
Articulating with a slight projection at the anterior external angle of either 
intermediate sclerite is a delicate process, more strongly chitinised at its base, 
