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On Anopheles Mattogrossensis from Venezuela with Description of the Male

According to Dyar (1928) Anopheles mattogrossensis Lutz and Neiva, 1911, is found in Venezuela in the Catatumbo River, State of Zulia. This river belongs to the Lake Maracaibo basin. At La Ceiba, State of Trujillo, a port on this lake, surrounded by forested and swampy country in a flat land, A. mattogrossensis has been infrequently found since 1937. Conditions here are very similar to those at Iquitos, Peru, and in some parts of the Amazon Valley in Brazil, where Shannon (1933) found A. mattogrossensis, also very rarely, in open and forested country with field and forest streams, pools, marsh and swamp waters.

In 1937 only eight larvae of A. mattogrossensis were found among 1123 that were identified from La Ceiba. In the first six months of 1938, six out of 618 classified larvae were A. mattogrossensis, and 31 females of A. mattogrossensis were caught in houses among 675 adults identified most of which were A. darlingi and A. punctimacula; of this number, 25 were found at night and six during the day-time.

Received November 28, 1938.