-4- 



10. Ocelli absent. -Dibusa 

 Ocelli present. -11 



11. Mesonotum convex; scutellum with a large 



oval wart. Faleagapetus 



Mesonotum flat, scutellum without a large 



oval wart. -12 



12. Metascutellum as wide as scutum, short, 



rectangular. -Stactobiella 



Metascutellum narrower than scutum; pen- 

 tangular or triangular. -13 



13. Metascutellum pentangular. Leucotrichinae* 

 Metascutellum triangular. Metrichia 



*Leucotrichia and Zumatrichia are treated under the species 

 section. 



Eleven genera are treated in this section, they are as fol- 

 lows: Agraylea Curtis comprised of 3 species which may be consi- 

 dered to be distributed in northern U.S.A. and southern Canada. 

 One species A. multipunctata is a holarctic one. The other two oc- 

 cur in more restricted areas i.e. A. costello in n.e. U.S.A. and 

 southeastern Canada and A. saltesea in northwestern U.S.A. Dibusa 

 Ross is comprised of one (1) species from southeastern and southern 

 U.S.A. Ithytrichia has two species, I. clavata being very wide- 

 spread and I. mazon known only from 111. and Ky. Leucotrichia 

 Mosley is for the most part Neotropical, but three (3) species occur 

 in U.S.A. Two, L. limpia and L. sarita are found in Arizona and 

 Texas, the third L. pictipes (Banks) is known from 17 states, nine 

 western and eight eastern. The distribution follows the Rocky Moun- 

 tain and Pacific coast areas on one hand and the northcentral and 

 northeastern areas on the other. Another Leucotrichinae, the genus 

 Zumatrichia Mosley, has one species in the U.S.A. occuring in Ari- 

 zona and Montana. Mayatrichia Mosley contains a very widely spread 

 species, M. ayama . This species described from Mexico has been 

 taken from Florida to Quebec to Montana. The other three are known 

 only from southwestern or western states. Metrichia Ross is consi- 

 dered here to be a valid genus. Although the larvae are quite simi- 

 lar to those of Ochrotrichia the larval habits have differences and 

 the adults are morphologically distinct. Three species occur in 

 southwestern U.S.A. and the genus is also known from as far south as 

 Chile. Orthotrichia Eaton has been studied by Kingsolver and Ross 

 (1961). Here again we have two widespread species namely, 0. aeger- 

 fasciella (Chambers) , an eastern species that has been known as 0. 

 americana Banks and most of the records are under that name, and 0. 

 cristata that has been taken from British Columbia to Quebec and 

 Florida. The others, 0. baldufi and 0. instabilis extend from Maine 

 to Florida; with 0. curta and 0. dentata known from Florida. Falea- 

 gapetus Ulmer a genus with two western species P. guppyi and 



