Host Relationships of Miltogrammine Flies. Musca tabaniformis was descriptionbed in 1805 by Fabricius (Syst. Antliat. p. 302) from Morocco, and was later made the type of the genus Craticulina Bezzi (1906 Zeitschr. Hym. Dipt. VI, p. 49). It appears to be widely distributed in Africa, having been recorded from Nyasaland and Natal. It is common in the Salisbury and Bulawayo districts from October to May. The genus Craticulina is included in keys to the Palaeartic and World fauna by Rohdendorf (1927) and Townsend (1935) respectively. It belongs to a group of the sub-family Miltogramminae which is associated with certain fossorial and other Hymenoptera.
Forcipomyia wansoni sp. nov. Male. A small, almost black species with unornamented wings and legs. Wing length. - 1.0 mm. Bead. Eyes very narrowly separated above by less than the width of one facet: clypeus and mouth parts brown; vertex dark brown. Palps. - Five-segmented but segments IV and V nearly fused; segment III very slightly expanded near the middle without a sensory pit; the relative lengths of the segments are, II, 8; III, 18; IV + V, 17.
A detailed exposition on genera and species cannot be undertaken here. Among the Trypetidae species are generally well-defined, but such a statement is tentative since more material may reveal a greater number of intermediate forms. Specimens of a species from widely separated localities show very minor variations, and distinct, apparently geographical forms as in Pliomelaena brevifrons, are not common. At the same time, distinctions between species become less easy when they are more numerous in a genus, as in Isoconia.
In the short review that follows, an account is given of the external morphology of the Trypetidae as far as is necessary for present descriptionptive needs; it is, further, from a taxonomic and terminological rather than from a detailed morphological aspect.
Dacus (Afrodacus) lucidus, sp. n. It differs from biguttulus, Bez. in having only one inferior orbital bristle, the scutellum yellow and upper cross-vein infuscated; from nigrivenatus, Mro., which also has one inferior orbital, by the spots on the face and the absence of strong, silvery, sub-median stripes on the thorax.
In the following paper seven species are descriptionbed as new; in one case, Kleothrips, the genus is an addition to the South African fauna. I am greatly indebted to Professor Faure for allowing me to study and descriptionbe his material of Hoplandrothrips and to use the notes which he had prepared for the species Hoplandrothrips arrhenus sp. n., H. edentatus sp. n. and n., flavidus sp. n.
This group of Noctuids belongs to the tribe Trifini, which has M2 of the hindwing more or less obsolescent and from middle of DC or from just below middle. The Cuculliae are distinguished from allied sub-tribes by having smooth eyes (hairy in the Hadenae), mid- and hindtibiae without spines (with spines, or at least with the hindtibiae so, in the Agrotides), and the eyes with overhanging eyelashes (not present in the Acronictae).
For the study of certain aspects of insect development it is generally desirable to carry out experiments in an atmosphere of which the temperature and humidity remains constant over long intervals of time. The particular system of control to be used will depend on a) whether the air is limited to a confined space, as for example in small cabinets for experiments on insects, in which the same air is used over and over again or b) whether there is a continuous supply of fresh air, as is for instance the case in general air-conditioning in houses. In this paper case a) only will be considered.