426 THE ANIMAL PARASITES OF MAN 



Genus 4. Stethomyia, Theob. 



Mono. Culicid., iii., p. 13, 1903. 



Two species occur in the marked genus one 5. nimba, Theob., from 

 British Guiana and Para, another 5. fragilis, Theob. , from the Malay States. 



The former may be a malarial carrier, for Dr. Low says, " Malarial 

 fever is got amongst the Indians and often of a severe type. In that con- 

 nection it is interesting that in the interior, at a place called Corato, I got 

 an entirely new Anopheles in large numbers." The genus is easily told by 

 its unornamented wings, flat head scales, mammillated prothoracic lobes 

 and long thin legs. 



Genus 5. Pyretophorus, Blanchard ; Howardia, Theobald. 



Compt. Rend. Hebdotn. Soc. d. Biolog., 23, p. 795 ; Blanchard, Journ. Trap. 

 Med. y v., 181, and Mono. Culicid., iii., 13, 1903, Theobald. 



Ten species come in this genus, of which Anopheles costalis, Loew, is the 

 type. 



This genus is found in Africa, India, Europe and in Australia. Two 

 species are proved malaria bearers, namely, P. costalis, Loew, and P. chau- 

 doyei, Theob. Members of this genus can be told by having narrow-curved 

 thoracic scales, hairy abdomen, and much spotted wings. 



Genus 6. Arribalzagia, Theobald. 



Mono. Culicid., iii., pp. 13 and 81, 1903. 



A single species only occurs, found in South America. The thorax and 

 abdomen have scales and hairs respectively, as in Pyretophorus, but the 

 abdomen has in addition prominent lateral apical scale tufts to the segments 

 and a scaly venter. Wings with membrane tinged in patches and wing 

 scales bluntly lanceolate and very dense. The type is A. maculipes, 

 Theobald. 



Genus 7. Myzorhynchus, Blanchard ; Rossia, Theobald. 



Comp. Rend. Heb. Soc. Biologie, No. 23, p. 795, 1902 ; Blanchard, 

 Journ. Trop. Med., p. 181, 1902, Theobald. 



A very marked genus of large dark, densely scaled species, found in 

 Europe, Asia, Africa and Australia. The thorax with hair-like curved 

 scales ; the abdomen with ventral and apical scales, and a median ventral 

 apical tuft, and with very densely scaled palpi in the ? , and densely 

 scaled proboscis. It seems to be mainly an Asiatic and East Indian genus, 

 but three species occur in Africa and one in Australia. They are mostly 

 sylvan species and bite severely. 



Genus 8. Nyssorhynchus, Blanchard ; Laverania, Theobald. 



Mono. Culicid., iii., p. 14, Theobald ; Compt. Rend. Hebd. Soc. Biologie , No. 

 23, p. 795, Blanchard. 



A group of small, closely allied species found in India, Africa and Australia. 

 It appears to be essentially an Indian genus seven out of the twelve 



