NO. 1977. MONOGRAPH OF THE SIGNIPHORIN^—GIRAULT. 195 



3. Head anteriorly, a broad band between wings including the metathorax, and 



sutures between abdominal segments, ivory white; wings hyaline with a dis- 

 coidal cloud beneath the marginal vein. . (10) S. rhizococci Ashmead, new species. 



4. Body mostly yellow; thorax at anterior apex, band across base of abdomen, ovi- 



positor, and band across middle of front wings dark brown. 



Band at base of abdomen narrower, including hardly one-third of its length; club 

 of antennas entirely yellow (11) S. aleyrodis Ashmead, new species. 



Band at base of abdomen including more than one-third of its length; club wholly 

 yellow; no distinct band between the eyes. 



(12) S. coquilletti Ashmead, new species. 



Club of antennae with its apical half brown. (13) 8. aspidioti Ashmead, new species. 



Band at base of abdomen including more than one-half of the abdomen, some- 

 times with only the tip yellow; club of antennse shorter and wholly yellow. 



(14) S. townsendi Ashmead, new species. 



Later, in his South American Chalcidoidea, Ashmead (1904, p. 497) 

 included the two species then known to occur in South America. 

 Finally, Schmiedeknecht (1909) gave the treatment of the genus 

 implied already. 



DISTRIBUTION OF THE SIGNIPHORIN^. 



The Signiphorinse appear to be natives of the tropical or semitropical 

 portions of the Western Hemisphere, as far as can be told from our 

 present knowledge of them. Thus, of the 27 species now laiown 9 

 occur in Mexico, 8 in Brazil and Peru taken together, 5 in Florida, 5 

 in California, and 5 in the West Indies. Of the more northern and 

 colder portions of the United States, 1 species occurs in Pennsylvania, 

 1 in Illinois, and 4 in the District of Columbia. Austraha has 4 

 species and Hawaii 1 , all probably introduced forms ; the form occur- 

 ring in Hawaii was described from specimens from the United States, 

 probably California and occurs also in Florida, Brazil, and Mexico. 

 The described Australian species has never been recorded from any other 

 locality. The greatest differentiation of tjq^e, then, occurs, so far as 

 yet Imown, in the tropical and semitropical portions of the Western 

 Hemisphere, notably in Mexico and Brazil. The most common or 

 abundant species, so far as can be told from the proportion of speci- 

 mens occurring in the collection of this family are confined to the 

 same regions. The most closely related forms occur in Mexico. The 

 first record of a species was from Florida. The data concerning the 

 distribution of their hosts is not available but all of them appear to 

 be tropical or semitropical forms, occurring on plants growing in 

 hot climates. 



The genus is distributed from Pennsylvania, Maryland, District of 

 Columbia and Illinois, in the United States in the north, south to 

 Peru and Brazil and west to Austraha (New South Wales and 

 Queensland). 



