ARTHROPOD A— INSECTA. 455 



best represented in the Oligocenic beds of Florissant, Colorado, 



where numerous species occur. They are also found in British 



Columbia (Lithortalis picta Scudder, Sciomyza revelata Scudder, 



Heteromyza senilis Scudder, Ant homy a, two species, etc.), in the 



Green River beds of Wyoming (Sciomyza three species, Chilosia 



three species, Milesia quadrata Scudder), the White River of 



Colorado (Heteromyza detecta Scudder). The division Orthor- 



rhapha is likewise abundantly represented in America, especially in 



the Florissant beds, where thousands of individuals and more than 



a hundred species have been found. Examples: Palombolus flori- 



gerus Scudder, Tipula sixteen 



species, Mycetophaetus inter- 



medius Scudder (Fig. 1762) ; 



in the Green River beds of 



Wyoming (Stenocinclis two 



species, Tipula two species, 



Chironomus septus Scudder, ^-'Z / 



Sciara scopuli Scudder, Dia- QljI^ 



docidia (?) terricola Scudder, 



Boletina two species) ; the 



White River beds of Colorado 



and Utah (Pronophlebia ^/\'J^'' ^y^^^oph^J^s intermedius y^ 



S}i. Florissant, Col. , Oligocenic. (After 



rediviva Scudder, Tipula Scudder.) 

 two species, Chironomus two 



species, Mycetophila occultata Scudder, Sackenia arcuata Scud- 

 der, etc., Gnoriste dentoni Scudder, Lasioptera recessa Scudder, 

 Lithomyza condita Scudder), and the Tertiary of British Colum- 

 bia (Sciara deperdita Scudder, Brachypeza two species, Boletina 

 sepulta Scudder and Trichonta dawsoni Scudder). 



Order HEMIPTERA (Linn.) Handl. 

 (Heteroptera — Bugs.) 

 With fore wings more coriaceous in the basal portion, and more 

 coarsely veined than hind wings ; anal field of wings generally well 

 developed, but with never more than two veins ; more strongly de- 

 veloped in hind wings; anal furrow in front of Cu; the veins are 

 much reduced; R replaced by or coalescing with Sc; cross-veins 

 few or absent. Front of head not touching coxae; mouth with a 

 sucking proboscis. 



