ANALYTICAL TABLES. 191 



H— Hind wings broad at the base, and the part nearest the body 



folded like a fan when not in use (Sialidas. I 



HH— Hind wings narrow at the base and not folded. 

 I— AntenuEe knobbed, or enlarged, toward the end. 



(Myrmeleonidffi.) 

 II— Antennae without terminal enlargement. 

 J— Some of the transverse veins between the eosta and subcosta 



forked; wings brownish or smoky (HermerobildiE.) 



JJ— Transverse veins between the costa and subcosta simple ; 



wings greenish (Chrysopidae.) 



CC — Wings with branching veins and comparatively tew cross veins or 

 veinless. 

 D— Tarsi two- or three- jointed. 



E— Posterior wings smaller than the anterior (P.socidae.) 



EE— Posterior wings as large as or larger than the anterior ones. 



(Perlidae.) 



DD— Tarsi four- or flve-jolnted. 



E— Abdomen with setiform, many-jointed anal filaments. (Ephemerid«.) 



EE— Abdomen without many-jointed anal filaments. Second wings as 



large as or larger than the first. Moth-like insects. (Phryganeidas.) 



Although in the above table all the families in- 

 cluded have been grouped into one order of Neurop- 

 tera, the differences existing among them are so very 

 great that they are more properly separated into sev- 

 eral orders. The following table will indicate the 

 orders to which the several families belong. 



ORDERS. FAMILIES. 



Odonata Libellulidse. — Dragon flies 



Plecoptera Perlidae. — Stone flies 



Isoptera Termitidae. — White ants 



Corrodentia Psocidae. — Book lice 



Mallophaga . . . .Mallophagidae. — Bird lice 



Mecoptera Panorpidee. — Scorpion flies 



Trichoptera .... Phryganeidae. — ^Caddice flies, or Caddice worms 

 Sialidae. — Horned corydalis 

 Raphidiidae. — Found only in the far west 

 Mantispidae. — Somewhat like praying mantis 



Neuroptera.. <j chrysopidse.— Lace- winged flies 

 Hemerobiidae. 

 Myrmeleonidae. — Ant lions 



Table for Deterniining the Families of Diptera. 



(Arranged by permission from Williston's North American Diptera.) 



A— Head separated from the thorax by a neck ; never parasitic. 

 B— Antennse many-jointed, often longer than the thorax. 

 C — Dorsum of the thorax with a complete V-shaped suture (Tipulid».) 



