114 SPECIES OF STEGOMYIA [CH. 



55. Abdominal banding indistinct. 



Thorax with broad silvery-white patch on each side in front 



albolateralis. Theobald. 

 555. Abdomen unbanded. 



Thorax, six silvery spots . . . . argenteopunctata. Theobald. 



Thorax with dark-brown narrow curved scales. Scutellum with 

 very marked meridian lobe . . . . hatiensis. Carter. 



5555. Abdomen with apical white lateral spots. 



Thorax unadorned, except for pale scaled lines internally 



punctolateralis, Theobald. 

 Abdomen with basal white lateral spots. 



Thorax with two pale indistinct median parallel lines and two 

 silvery lateral spots . . . . . . minuta. Theobald. 



Thorax unadorned. 



White spot mid head tripunctata. Theobald. 



No white spot . . . . . . amesii. Ludlow. 



Thorax brownish-black with dark bronze scales. Abdomen clad 

 with purple-black scales and white triangular lateral spots 



fusca. Leicester. 



55555. Abdomen with silvery apical lateral spots on all segments except 

 first two . . . . . . tasmaniensis . Strickland. 



AAA. Proboscis yellow basally, dark apically. 



Abdomen with apical pale bands . . . . crassipes. Van der Wulp. 



AAAA. Proboscis with median interrupted white lines on 

 basal half. 



Head black, anterior margin grey . . albomarginata. Newstead. 



Desvoidya (five species). Large mosquitoes active by day like Stegomyia, 

 small with silvery venter, but less ornamented than Stegomyia. 



Leicestena (ten species). Resembling Desvoidya, but the female pupae are 

 half the length of the proboscis. 



Ochlerotatus . This genus as reconstructed by Edwards is an important one 

 from the large number of different forms included. Of the original genera 

 now sunk under Ochlerotatus, many contain but few species, and have not 

 been shewn to play any part in disease transmission. 



Culicada is a genus represented by many species and especially occurs in 

 North America and Europe. 



Howardina (seven species). The best known species in this genus is the 

 common H. sugens (Scutomyia Meigen = Stegomyia Meigen). 



Grabhamia (twenty-eight species). There are a large number of common species 

 of this genus which usually have a characteristic floury appearance. 

 They are of active bloodsucking habits. 



Mansonioides (three species). These have an even more pronouncedly floury 

 or " pepper and salt " appearance. 



Aedomyia and Numomyia. These are now domestic species, having no rela- 

 tion to any disease. Many do not, under ordinary circumstances, feed 

 upon man. 



