538 CALIFORNIA ACADEMY OF SCIENCES. 



of the 6 ; the terminal abdominal appendages also differ 

 in color and form." 



MiCRATHYRIA Kirb3^ 



Kirby, Trans. Zool. Soc. Loud, xii, p. 303, 1889. Karsch, Berl. Ent. 

 Zeit. xxxiii, p. 371, 1890. Calvert, Trans. Am. Ent. Soc. xx, p. 

 224, 1893. 



Synopsis of the North American species. 



Anterior lamina of $ at least as prominent as genital lobe; vulvar lamina of 

 ? not projecting. 



1. Extreme base of hind wiugs yellowish. $, Anterior lamina bifid 

 to base, apices narrower (viewed from the side), not denticulated; 

 iiamule more pi'ominent than adjacent pai'ts, curved forwards, outer 

 branch longer than inner; sup. app. with no inner inferior subba- 

 sal tubercle. 9 Abdomen widened at base and before apex, pale 

 stripes on 3-6 narrow. diclyma Selj's. 



2. Extreme base of hind wings reddish-brown, l^ Anterior lamina 

 biparted, apices denticulated; hamule less prominent than genital 

 lobe, not curved forwards, outer branch much shorter than inner, 

 sup. app. with no inner inferior subbasal tubercle. ? Abdomen of 

 nearly uniform width, j^ale stripes on 2-6 wide. Hagenii Kirby. 



3. Extreme base of hind wings i;ucolored. 5 Anterior lamina bilobed 

 to base, apices wider (viewed from the side), not denticulated; ham- 

 ule less prominent than genital lobe, not curved forwards; sup. app. 

 with an inner inferior subbasal tubercle. $ Abdomen widened at 

 base and before apex, pale stripes narrow. cequalis Hagen. 



Anterior lamina of S much less prominent than genital lobe; viilvar lamina 

 of 9 projecting. 



4. Extreme base of wings uncolored ( S ) or yellowish ( $). S Ante- 

 rior lamina entii'e; hamule less prominent than genital lobe, not 

 curved forwards; sup. app. with no inner inferior subbasal tubercle. 

 9 Abdomen of nearly uniform width. berenice Drury. 



Perhaps iicrra Hag. and dehilis Hag., both unknown to 

 the writer, may also belong to Micrathyria. JMicrathyria 

 (?) pniiiiosa Kirby, Ann. Mag. N. H. (6) xiv, p. 267, 

 Oct., 1894, from the West Indies, is also unknown to the 

 writer. 



