Life-history of Dasyliclea obscura, Winneriz. 589 



Keilin, D. (1917). " Recherches sur les Anthomyides a larves carni- 

 vores." Parasitology, vol. ix. pp. 325-450, pis. v.-xv. 



(1920). " On a new Saccliaromycete, Monosporella ttnicuspidata, 



gen. n. nom., n. sp., parasitic in the Body-cavity of a Dipterous 

 Larva {Dasyhelea obscura, Wiunertz)." Parasitology, vol. xii. 

 pp. 8.3-91. 



(1920). "On Two new C-Jregarines, AUantoci/stis dast/Jielei, n.g., 



n. sp., and Deiidrorhyiivlius systeni, n g., n. sp., parasitic in the 

 Alimentary Canal of the Dipterous Larvfe, Dasyhelea obscura, 

 AVinn., and Systenits sp." Parasitology, vol. xii. pp. 154-158, 

 pi. X. 



(1921). " On the Life-history"of Helicosporidium j)arasiticum, n. g., 



n. sp., a new Type of Protist parasitic in the Larva of Dasyhelea 

 obscura, Winnertz (Diptera Ceratopogonida3), and in some other 

 Arthropods." Parasitology, vol. xiii. pp. 97-113, pis. iv.-vi. 



Labotjlbi^nk, a. (1869). " Ilistoire des metamorphoses du Cerafo- 

 poffoji dufouri." Ann. Soc. Eut. Fr. 4*^ serie, vol. ix. pp. 157-166, 

 pi. vii. 



MiK, J. (1888). "Zur Biologie von Ceraiopoyon, Meig., nebst Berschrei- 

 bung einer neuen Art dieser Gattung"." Wien. Ent. Zeit. 

 vol vii. pp. 18.3-192, pi. ii. 



RjETH, J. Th. (1915). " Die Metamorphose der Culicoidinrn (Cerato- 

 pogoninen)." Archiv fiir Hydrobiologie, Supplement-Band ii. 

 pp. 377-442. 



X. EXPLANATION OF THE PLATES. 



[All the figures concern Dasyhelea obscura, Winnertz.] 



Plate XIX. 

 Fig. 1. Head of a full-grown larva, seen from the side: an., antennae; 



d., clypeus ; h., hypopharyux ; /., labium; M., maxillajj 



m., mandibles ; s., duct of salivary glands ; l-l-i, fourteen 



pairs of sensory organs. 

 Fig. 2. Labrum, seen from the ventral side. 

 Fig. 3. Maxilla, seen from the side. 

 Fig. 4. Egg taken out of the uterus of the $ , showing the gelatinous 



layer with small chitinous rods surrounding it. 

 Fig. 5. Antenna of the larva. 

 Fig, 6. Ilypopharynx, seen ventrally : /., lateral wing-like processes ; 



?■., posterior ridge of the ventral plate ; rd., lateral bifurcated 



rods connecting the hypopharynx with the labium ; 



s., salivary duct ; v., ventral plate. 

 Fig. 1, Ilypopharynx, seen laterally : d., dorsal plate; o., oesophagus; 



other letters as in fig. 6. 

 Fig. 8. Larva, full-grown, seen laterall3\ 



Plate XX. 



Fig. 9. Abdominal segments of the larva, showing the characteristic 



pigmented pattern. 

 Fig. 10. Labrum, seen doi-sally. 

 Fig. 11. Posterior &nd of the larva, seen laterally, showing the hooks, Ti., 



and the lateral protuberance,/;. 

 Fig. 12. Posterior end of the larva, seen dorsally, showing 2 pairs of 



hooks. 

 Fig. 13. Posterior end of the larva, seen ventrall}', showing 4 pairs of 



hooks. 



