74 ENTOMOLOGY. 



OKDER VIII. HEMIPTERA* (Bugs, Plant-lice, etc.}. 



While the preceding groups are of limited extent as regards 

 number of species, the one now before us is very rich in this 

 respect. We are now to take into account insects which 

 gain their livelihood by piercing and sucking 

 the sap of plants or the blood of other insects; 

 and the change in the jaws by which a sucking 

 beak is formed is very curious. 



One can obtain an excellent idea of what a 

 bug is by dissecting a common squash-bug 

 (Fig. 59). With a lens fixed on a stand, and a 

 FIG. 59. Squash- needle mounted in a handle, the student can, 

 bug. Nat. size. a ^ er a -f ew trials, dissect the head from the 



body, examine the beak, the wings; separate the thorax 



* SELECTED WOKKS. 



Amyot, C., and Serville, A. Hemipteres (Paris, 1843). 



Buckton, G. B. Monograph of the British Aphides (Ray Society. 

 i., ii. London, 1876-79). 



Comstock, J. H. Report of U. S. Entomologist (Dept. Agr.) for 

 1879-1881 (Washington, 1880-82). 



Douglas and Scott. British Hemiptera. I. Heteroptera. (Ray So- 

 ciety. London, 1865.) 



Fieber, F. X. European Hemiptera (Vienna, 1861.) (In German.) 



Geise, 0. Mundtheile der Rhynchoten (Archiv f. Naturg., xlix., 

 315. 1883). 



Glover, T. Manuscript Notes: Hemiptera (Washington, 1876). 



Oestlund, 0. W. Synopsis of the Aphididoe of Minnesota (St. Paul, 

 1887). 



Eiley and Monell. Notes on Aphidse of the U. S. (Bull. U. S. 

 Geol. Surv., v. Washington, 1879.) 



Thomas, C. Monograph of the Plant-lice (8th Report State Ento- 

 mologist of 111., 1879). 



Uhler, P. R. Monographs of Cydnidae and Saldfe [etc.]. (Bull. U. 

 S. Geol. Surv., iii., 1877). 



Check-list of the Hemiptera- Heteroptera of North America (Brook- 

 lyn, 1886). 



Walker, F. Catalogue of Hemiptera-Heteroptera in British Museum 

 (8 vols. and suppl. 1867-74). 



Witlaczil, E. Die Anatomie der Psylliden (Zeits. f. Wissensch. 

 Zool., Bd. xlii. Wien, 1885). 



Zur Morphologic und Anatomie der Cocciden (Zeits. f . Wis- 

 sensch. Zool. Wien, 1885). 

 Also the writings of Ashmead, Comstock, Forbes, Landois, Le 



Baron, Monell, Osborn, Riley, Say, Thomas, etc. 



