ENTOMOLOGY

SANITARY ENTOMOLOGYthe larvae can be developed to the so-called "sausage" stage in Aedesargenteus (Stegomyia calopus). Experiments with Anopheles albimanus( albipes), Culex taeniatus, C. quinque{asciatus (fatigans), and othermosquitoes, fieas, and ticks failed to result in any development of thelarvae. Fiillebom (1908) \vas able to develop the larvae to the sausagestage in Anopheles maculipcnnis and Aedes argenteus (Stegomyia calopus),but no development occurred in the tick, Ornithodoros moubata.Further investigations are necessary to determine what insects serve asintermediate hosts for F. demarquayi.Filaria philippinensis Ashburn and Craig, 1906The adult stage of this parasite of man is unknown. The first-stagelarvae occurring in the blood of man are morphologically identical withthose of Filaria bancrofti. Unlike the latter, however, they show noperiodicity. Ashburn and Craig (1907) have shown that the larvae willundergo development in mosquitoes, Culex quinque{asciatus (fatigans) ,similar to that of the larvae of F. bancrofti. It is questionable whetherF. philippVnensis should be recognized as a distinct species.Filaria tucumana Biglieri and Araoz, 1917This species, the adults of which are unknown, is base~ on microfilarirefound frequently in the blood of human beings in Argentina. It appearsto be comparatively harmless. Biglieri and Araoz (1917) conclude thatmosquitoes act as intermediate hosts and apparently consider Aedesargenteus (Stegomyia calopus) the most important vector" though definiteproof of this has not been. obtained.Filaria cypseli.Annett, Dutton and Elliott, 1901The adult stage of Filaria. cypseli occurs in the subcutaneous tissueof the head of the swift, Cypselus affinis, also beneath the subcranialfascia. The embryos or first-stage larvae occur in the lymph and. rarelyin the peripheral blood of infested birds. Dutton (1905) has describedvarious larval stages of the parasite which he finds in an undeterminedspecies of bird-louse belonging to the subfamily Leiothinae that occurson swifts. The first-stage larva as it is found in the blood of the birdand the stomach of the louse is provided with a sheath as in variousother species of Filaria. This sheath is lost and the larva probably soonpenetrates th~ stomach wall. rl'he next stage of the parasite is foundi~ the fat-body of the louse as are two later stages described by Dutton.The last stage of development seen. by him is found free in the body