CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS II 5 



AA. Fore tibiae slender. 



B. Hind femora stout (True Crickets). 



C. Last segment of the maxillary palpi of the same length as the 

 next to the last. — Grylliis. 

 CC. Last segment of the maxillary palpi double the length of the next 

 to the last. — Nemobius. 

 BB. Hind femora slender (Tree Crickets).- — CEcanthus. 

 Specks of Cryllus: 



A. Black field crickets. 



B. Ovipositor 13-14 mm. long; male more slender. — G. pennsylvanicus . 

 BB. Ovipositor 18 mm. long; male stout. — G. ahhrevialus. 

 AA. Straw colored house crickets.— <?. domeslicus. 

 Species of Nemobius: 



A. Ovipositor longer than hind femora and straight; color blackish, arranged 

 in longitudinal bars. — N. fasciatus. 

 AA. Ovipositor shorter than hind femora and arcuate. — N. exiguus. 



Fig. 70. — Markings on basal segments of antennae of CEcanthus: a, CEc. niveus; 

 b, CEc. angustipennis ; c, CEc. nigricornis; d, do. 



Species of CEcanthus (Fig. 70): 



A. Antennae with one black mark on each basal joint. 



B. Black marks like small rounded dots. — CE. niveus. 

 I BB. Mark on first joint long and hooked, that on second oblong. — CE. 



angustipennis. 

 AA. Antennae with two black marks on the first basal joints. 



B. Antennae wholly black, also head, thorax and legs. Marks on first 

 joint of antennae generally connected at apex. — CE. nigricornis. 

 BB. Pale greenish white; marks on antennae elongate, parallel, distinct. — 

 CE. 4-punctalus. 

 AAA. Antennae without marks on first joints, wing-covers broad; head and first 

 joints of antennae pink. — CE. latipennis. 



The Pennsylvania Field Cricket {Gryllus pennsylvanicus Burm.). — 

 The field cricket is omnivorous and seldom does enough damage to 

 merit special attention. It is fond of grain, however, and often enters 

 barns destroying a considerable amount of grain. 



Adult. — A large black cricket existing in two forms — the commoner 

 short-winged form in which the wings are rudimentary and the long- 



