84 ANIMAL PAKAS1TES. 



been troubled with these guests, by two rubbings with a few drops 

 of rosemary oil. According to Martiny rubbing with simple oil 

 or fat is sufficient. The essential oils are certainly more sure in 

 their action. The insect-powder is also used against them with 



advantage. 1 







Second Sub-Class Insects with an incomplete metamorphosis 

 = HEMIMETABOLA. 



Order RHYNGOTA = HEMIPTERA. 



Corporis tres regiones bene distinctae ; caput parvum, latum, 

 triangulare, tenue ; labium (lower lip), transverse articulatum in 

 rostri vaginam mutatum, quce canalem cavam, et ad anteriorem 

 partem apertam exhibet ; 4 sette tenues (pugionem formantes) in 

 rostri vagina inclusce, musculis fusiformibus motce, quarum 2 ex- 

 teriores, validiores, in apice uncinatce mandibulas, quarum 2 in- 

 terior es firmius inter se conjunctce maxillas prabent. Labrum (upper 

 lip) in initio rostri vaginae siium, operculum tenue est } ad linguae 

 instar formatum. Palpi maxillares et labiales desunt. Antennae 

 fiiliformes, diver sis simae. Stemmata parvula, rotunda ,prominentia ; 

 oculi adjutorii nulli. Alee varice, rarissime mullae, uti in Acanthia 

 lectularia (the bed-bug). Thorax perclaro scuto, inter dum scutello. 



Pedes ambulatorii tribus tarsi articulis ; inter dum pedibus an- 

 terioribus ad raptum, pedibus posterioribus ad natandum idoneis. 



Ganglia thoracica 2, inter dum in unum coalita. (Esophagus 

 augustus, ventriculus chyli amplus, multifariam, tortus, cvjus anterior 

 pars glandulosa, media intestino similis et posterior torta est. In- 

 testinum breve, pyriforme. Glandula salivales perclara, sine dubio 

 venenum parantes, tantum in Ophididis nullce. Canales urinarii 4. 

 Trachea varice. 



Ovaria plerumque 4 8 tubi rudiformes ; loculus seminalis 

 simplex, longus, pyriformis ; loculus copulatorius nullus ; vix organa 

 ferrumen (cement- organ) parantia. 



Testiculi ex numero varii, culeiformes ; ductus deferentes lon- 

 gissimi ; penis simplex tubulosus. 



Ovula larvas, parentibus similes, usque non alatas tenerrime plu- 

 mosas, vernatione pluries exuta, alarum vaginis aut alis ornatas, 

 parientia. 



Pro nutrimento succis et plantarum et animalium utunlur. Ani- 

 malia plerumque socialia. 



1 The mercurial ointment is a well-known and efficient remedy in this country. TKANS. 



