Common Insects — Grasshopper and Honeybee 395 



(rek'tum) (L. rectus, straight) opening through the anus (a'nus) (L. 

 anus, anus) . Other types of insects have different kinds of mouth parts. 

 Some have a sucking (siphoning) mouth part (Fig. 201), while others 

 have a piercing-sucking type (Fig. 202) . 



Fig. 192. — Chewing mouth parts of the grasshopper (Rhomaelia microptera) . 

 L, Labrum (upper Hp) ; M, mandible (jaw) ; Mx, maxilla; La, labium; CI, 

 clypeus; C, cardo; St, stipes; Lac, lacinia; Ga, galea; Mp, maxillary palp; Pa, 

 palpifer; Me, mentum; Sm, submentum; Li, ligula; LP, labial palp. (From 

 White: General Biology, The C. V. Mosby Co.) 



Circulation. — A single, tubular heart in the dorsal side of the abdo- 

 men is divided by valves into a series of chambers, each with a pair of 

 ostia (os'tia) (L. ostium, door) for the entrance of blood from the sur- 

 rounding pericardial sinus (Gr. peri, around; kardia, heart) (si'' nus) 

 (L. sinus, cavity). Valves close the ostia when the heart contracts. A 



