HOW TO KNOW THE> IMMATURE INSECTS 



(d) Elongate (Fig. 10). — Many eggs are elongate, 

 as for example, the eggs of leafhoppers, tree- 

 hoppers and tree crickets. 



Eggs of this type are often inserted in nar- 

 row cavities such as hollow grass stems or in 

 burrows made with the ovipositor or lend 

 ,^r- themselves readily to being laid in compact 



Fig. 10. Eggs: a, sugar- j -a r- 



cane leafhopper, Perkin- arOUPS 



sielia saccharicida Kirk- ^ ^ 



cidy; b, Mexican bean 



beetle, Epilachna vorives- 



tis Mulsant; c, housefly, 



Musca domestica L. 



(e) With appendages (Fig. 11). — The eggs of a 



water scorpion have eight or more filaments . \ y, 

 radiating from the upper rim. Pentatomid ^%i^;v7ii 

 eggs are usually beset with a circle of spinej ^ ' ' 

 around the upper edge. Reduviid eggs have 

 a definite cap at one end. The poultry louse 

 has a striking egg, — white and covered with 

 glass-like spines. The free end of this egg is 

 furnished with a lid which bears at its apex 

 a long lashlike appendage. 



Fig. 11. Eggs: a, Podi- 

 sus maculiventris Say; b. 

 Mayfly, Tricorythodes al- 

 lectus (Needham). 



(f) With sculpturing (Figs. 12 and 13).— The sur- 

 faces of insect eggs may be entirely smooth 

 or with imbricated designs. Eggs that are 

 laid in wood, leaves, or in the ground are 

 frequently without sculpturing. The eggs of 

 Curculionidae and Scarabaeidae are per- 

 fectly smooth. On the other hand, many 

 eggs are reticulated or strikingly marked. 



These reticulations are the imprints of the 

 cells of the follicular epithelium. The eggs 

 of the flower flies are chalky white and 

 microscopically sculptured. The leaf-mining 

 flies (Genus Pegqmya) usually have eggs 

 that are well marked by hexagonal or poly- 

 gonal areas. The eggs of many butterflies 

 and moths such as Pieridae, Noctuidae, etc. 

 are deeply ridged and strongly sculptured. 



Fig. 13. Peridroma sou- 



cia Hubner: a, egg; b, 

 egg mass. 



