SUBPHTLUM III 



INSECTA 



799 



of crickets are known from the Green Eiver Ecoene of Wyoming, and 

 are found also, with locusts, in the Miocene lacustrine beds of 

 Florissant, Colorado. Various European species are known of Bry- 

 madusa Stein. (Fig. 1539), and Gnjilas Linn. (Fig. 1540). 





Fio. 1539. 

 Drymadusa speciosa (Heer). Miocene ; Oeningen, Baden, ^/i. 



Suborder B. ACRIDIOIDEA Handlirsch. 



Fig. 1540. 



Gryllus mncrocercus 

 Germar. Lower Oli- 

 gocene; Baltic 

 amber. 3/., (after 

 Germar). 



(Grasshojopers). 



Stridulating organs sitnated in the hind femora and a modified longitudinal vein of 

 the fore ivings. Auditory organ on the side of the first abdominal segment. Antennae 

 short, composed of less than thirty segments. Tarsi short, three-jointed. No exserted 

 ovipositor in the female. 



Fio. 1541. * 



Tyrbuki russelU Seudder. Miocene lake 

 beds ; Florissant, Colorado. 3/^ (after 

 Seudder). 



This is a grouj) of com- 

 paratively late origin, and is 

 derived in all probability from 

 the Locustopsidae or similar 

 locustoid ancestors. Grass- 

 hoppers are known from the 

 Green Eiver Eocene of Wyom- 

 ing, and from the freshwater 

 Miocene of Florissant, Colorado, 

 and elsewhere. Tyrbula (Fig. 

 1541) and Nanthacia Seudder, 

 etc., are examples. 



Fio. 154:2. 



Chresmoda obscura Germar. Lithographic Stone (LTpper Jura) ; 

 Solenhofen, BaAaria. 4/^ (after Handlirsch). 



Order 6. PHASMOIDEA Leach. (Walking-sticks, Leaf Insects, etc.) 



Body usually long and slender, mouth parts ortliopteroid, fore ivings rarely well 

 developed, iijithout stridulating organ, and loithout visible demarcation between the 

 cubital and anal areas. Hind ivings with large, folded anal lobe ; hind legs not 

 saltatorial, usually long and slender like the other pairs. Gerci short, genital appendages 

 of the female not prominent, tarsi five-jointed. 



Here is placed the Upper Jurassic genus Chresmoda Germar (Fig. 1542), which. 



