Entomology. 



is the science which treats of the anatomy or structure, development, tran 

 formations, classification and habits of insects. 



CLASS INSECTA (Insects.) 



1. Hard parts external, being rings or segments, joined or articulated: 

 together. 2. .Jaws move laterally, or from side to side, and not up and 

 down as in the dug. 3. The long tuliular alimentary canal occupies the 

 center of the body. 4. Above the alimentary canal is the heart or dorsal 

 vessel, which sends the yellow or colorless blood to the head, whence it courses • 

 throughout the whole body, retui'ning again through valves to the dorsal ves- 

 sel. 5. Below the alimentary canal or on the ventral side is the nervous 

 system; two longitudinal cords, each witli a knot corresponding to eax:h seg- 

 ment. 6. Respiration is carried on by n':eans of a system of tubes called 

 Tracheae, ramifying throughout the whole body, and opening through the 

 sides by pores called Spiracles. 



Order I. — 1. Segments grouped into three distinct regions, — Head, 1 2 



Thorax and Abdomen. 2. Eyes compound and simple, j 

 3. Two pairs of wings (diptera one). -i. Three oairs of j ui)'!'' 

 thoracic legs. 5. One pair of jointed abdomir,al appf.iid- [ 

 ages. 6. A more or less complete metamorphos's, — Etrsr, (^Six-fuoted 

 Larva, Pupa, Imago. J 



Oi'der II. — 1. Segments grouped into two regions, a false cephalo- ] B 



thorax and an abdomen. 2. No antennae. 3. Without j 

 wings. 4. Eyes simjjle. o. Four pairs of thoracic legs. [► '^''•|^'^"^'I - 

 6. Three pairs of jointed abdominal appendages CSpinner- | 

 ets) often present. 7. No metamorphosis. j, (Spi'li-rs.) 



Order III. — 1. Body cylindrical, ^.'orm-like. 2. Segresntsnot) 4 



grouped into regions. 8. Head free. 4. Eyes simple. | 

 5. Antennae present. &. Wingless. 7. Numerous ab- }- ■^^^j^V'^" 

 dominal legs. 8. Yelk-sa?k present for a. short period af- | ( Many-foot- 

 ter hatching. £*■. No m.-staiiiorphosis. J ed Insectx.) 



Ori>er L— HEXAPODA. 



Metuhola. — 1. Metamorphosis complete. 2. Body usually cyl- ) ^' 



indrical. 3. Prothorax small. 4. Mouth-parts more \ hymkX(iP- 



generally haustellate — formed for sucking (Hymenojjtera, [ 'n;KA. 

 mandibulate). 5. Pupa inactive. 6. Larva usually { ^'r*!/.'.'!'^'" 



cylindrical, very unlike the adult. J jjiftkh'a. 



