The development of the Leishman-Donovan parasite in Cimex rotundatus : second report / by W.S. Patton.

  • Patton, W. S. (Walter Scott), 1876-1960.
Date:
1908
Catalogue details

Licence: In copyright

Credit: The development of the Leishman-Donovan parasite in Cimex rotundatus : second report / by W.S. Patton. Source: Wellcome Collection.

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    in the median line the thick first segment of the labrum which is continuous with the dorsal integument of the head. The antennae consist of four segments, the first two being the thicker, while the third and fourth are slender and covered with long hairs. The prothorax is semilunar in shape wdth two rounded horns extending close up to the eyes ; its upper surface is raised in the centre and towards the sides, ending abruptly at a line a little beyond the level of the eyes ; the re- mainder of the surface including the two horns is flattened from above down- wards. The ventral surface of the prothorax is concave and hollowed out on each side of the raid-line where the first pair of legs are inserted. The mesothorax as seen from the dorsal surface is triangular in shape with its apex projecting over the metathorax and between the elytra. The metathorax next in size to the prothorax is almost entirely covered on its dorsal side by the elytra, and on the ventral surface is seen as a small cleft on the inner side of the middle coxa. The elytra which are inserted into the mesothorax just below the lateral angles are two rudimentary scallop-shaped pieces of chitin lying over the metathorax and sides of the first abdominal segment. Their dorsal surfaces are convex and covered with bristles, while their ventral surfaces are concave. The abdomen is rounded and consists ol seven segments with an eighth anal appendage. It is broadest at the third segment and gradually becomes narrower towards the end where it is covered with long hairs. In the male the penis is seen flexed in a notch between the seventh and eighth segments. This bug is distributed throughout Europe and North America, and is also found in Suez, Egypt, the Sudan, the North-West Frontier Province of India, China, South Africa and Australia. Cimex rotundatus Sign or the Indian bed-bug is darker than the above species being of deep mahogany colour ; its bead is not as long or as broad as that of lectularius. Its prothorax is also narrower and shorter, is more rounded and not flattened at the sides as is the prothorax of the type species. Its abdomen is less orbicular, being broadest at the second segment and tapers more abruptly towards the end ; in all other respects it is similar to Cimex lectularius. Cimex rotundatus is distributed throughout India, Burma, Assam, Malay, and is also found in Aden, Sierra Leone, the Islands of Mauritius, Reunion, St. Vincent and Porto Rico. Cimex pipistrelli ]tViYC\s is similar in colour to rotundatus, its prothorax is also less marginal and in all other respects it is more closely allied to the Indian bed-bug. Cimex columbarius Jenyns has a similar prothorax to lectularius and is also of the same colour.