168 OKTHOPTEEA. 



Table for separating the Species of Lactista. 

 A. Pronotal carina cristate, rather strongly arcuate, deeply cut by the 

 principal sulcus. Posterior lower angle of the pronotum rounded. 

 Hind tibiae blue. 

 b. Crest of pronotum evenly and strongly arched, obliquely and 



deeply cut by the transverse sulcus 1. gibbosus, Sauss. 



bb. Crest of pronotum not arcuate, the notch less profound ... 2. oslari, Caudell. 



AA. Pronotal carina only moderately elevated, straight or nearly so, not 



deeply cut. Posterior lower angle of the pronotum variable in 



shape. Hind tibise variable in colour. 



b. Lateral lobes of the pronotum with the posterior angle produced 



into an acute tooth. Disc of wings usually some shade of 



orange or red 3. punctatus, Stal. 



bb. Lateral lobes of the pronotum with the posterior angle obliquely 

 truncate. Disc of wings paler. 

 c. Disc of wings hyaline, pale blue, rose, or yellow. Median 



carina of pronotum cristate throughout 4. pulchripennis , Sauss. 



cc. Disc of wings yellow. Median carina of pronotum cristate on 



front lobe only 5. pellepidus, Sauss. 



1. Lactista gibboSUS, Sauss. 



Lactista gibbosus, Sauss. Prodr. (Edip. p. 143 (1884) x ; Scudd. Cat. Orthopt. U.S. p. 38 (1900) 2 . 

 Arphia hesperiphila, Rehn, Canad. Ent. xxxiv. p. 143 (1902) 3 . 



Hab. North America, San Diego and Los Angeles, California 1_3 (coll. L. Bruner) ; 

 Lower California, Sierra el Taste (Eiseri). — Mexico, Mazatlan, Sinaloa (coll. Pldlad. 

 Acad. Hat. Sci.). 



2. Lactista oslari, Caudell. 



Lactista oslari, Caudell, Proc. U.S. Nat. Mus. xxviii. p. 468 (1905) \ 



Hab. North America 12 , Nogales, Arizona (coll. U.S. Nat. Mus), Albuquerque, 

 N. Mex. (A. N. Caudell). 



Coming as this insect does from the very borders, it will surely be taken in Mexican 

 territory as well. L. oslari seems to be very closely related to the preceding species. 



3. Lactista punctatus, Stal. (Tab. II. figg. 11, ll a, 2 .) 



(Edipoda punctata, Stal, Recens. Orthopt. i. p. 130 (1873) \ 



Lactista punctatus, Sauss. Prodr. (Edip. p. 143 (1884) 2 ; Rehn, Trans. Am. Ent. Soc. xxvii. p. 227 

 (1901) s ; Proc. Acad. Nat. Sci. Philad. 1904, p. 526*. 



Hab. Mexico 1_4 , Presidio, Vera Cruz, Atoyac, &c. (H. H. Smith, Schumann), Dos 

 Arroyos and Rio Papagaio in Guerrero (//. H. Smith), Orizaba (Saussure 2 ) ; Guate- 

 mala 2 ; Costa Rica, San Jose (P. Biolley & C. F. Underwood). 



Found in Guerrero in September and October. 



