246 PROC. ENT. SOC. WASH., VOL. 46, NO. 9, DEC, 1944 plantes (Agromyzinae) et des animaux (Oestridae). Ces formations sont toujours places dans le voisinage inmediat des disques imaginaux des pattes; ne seraint-elles pas un dernier vestige des pattes larvaires? Cette hipothese parait vraisemblable, car, si Ton en trouve dans certaines families de Coleop-teres {Larinus maculosus et autres), on voit ces rudiments, sous forme de petits mamelons incapables de servir a la locomotion, et neanmoins surmontes de polls sensoriels. Ainsi: la patte des larves d'Insectes, organe a la fois ambula-loire et sensitif, pourrait disparaitre en tant qu'organe ambulatoire, mais per-sisterait toujours en tant qu'organe sensoriel." Another class of sensorial organ consists of a pair of small cylindrical processes articulated at the base which are found on each segment from the first to the tenth and are located more or less laterally. (Fig. 12.) SUMMARY This work is on the first instar larva of Acridiophaga caridei (Breth.), the most effective parasite of Schistocerca paranensis Burm. Two particularities must be pointed out: The operation of the oral hooks which move in a horizontal plane and the pres-ence of a pair of claw-like organs, close to the posterior spiracles. BIBLIOGRAPHY Blanchard, E. E., 1939, Los Sarcofagidos argentinos, contribucion a su conoci-miento. Physis, Buenos Aires, 17: 791-856. Brethes, J., 1906, Sarcophaga caridei, una nueva mosca langosticida. An. Mus. Nac. Buenos Aires, (3) 6:297-301 . Keilin, D., 1915-1916, Recherches sur les larves de Dipteres Cyclorhaphes. Bull. Sc. France et BelgiqUe, 49:15-198, 16 lam. Snodgrass, R. E., 1924, Anatomy and metamorphosis of the apple maggot. Jour. Agric. Research, Washington 28 (1) :l-36. 1935, Principles of insect morphology. New York. SOME AFRICAN MEGACHILID BEES By T. D. A. COCKERELL All the bees recorded here will be returned to the British Museum when circumstances permit, except Megachile natensi-ella, which goes to the Museum at Pretoria. Megachile (Creightonella) weenenica, new species Male. — Length about 15 mm.; rather slender, with parallel-sided abdomen; black, including antennae and mandibles, but front femora and tibiae suffused with red in front, apical margin of transverse keel of sixth tergite red, and seventh tergite dusky red; head and thorax with abundant white hair, but scutellum with an admixture of long, black hairs; sides of fir<5t tergite with long white hair, second to fourth with broad, white hair bands at sides, reduced to a
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