GUAM AGRICULTUKAL EXPERIMENT STATION, 33 



raising, as it attacks newly born and defenceless animals in the 

 nuicosse, producing lesions which often lead to serious maiming or 

 death. Wounds on the backs of hogs frequently become blown by a 

 large bluebottle, Calliphora sp. 



HOUSEHOLD INSECTS. 



A large number of common insects are included under this head- 

 ing — insects which have in a way become domesticated and by the 

 movements of men from one place to another or by commercial oper- 

 ations have become almost cosmopolitan. Most of these are annoy- 

 ing pests and are much more prevalent and annoying in Guam than 

 els(>where. 



The common house fly, Musca domcstica, and another muscid 

 breed in animal droppings wdth very little check and become ex- 

 cessively annoying insects, not only in dwellings but throughout 

 the island along the traveled roads. There are two species of mos- 

 quitoes. 'a culicine {Culex sp. near vishfiui) and StegoTnyia scutel- 

 larls. The latter is very abundant in the forests and makes progress 

 through the brush very unpleasant. It is impossible to remain in 

 the country overnight with any degree of comfort. 



The Blattida' are represented by eight species. The common 

 house-infesting cockroaches, however, are Perijylaneta aTnericcma^ 

 Steleopyga deeorata^ and Polyzosteria soror. P, amencana^ usualh' 

 referred to as the " Guam eagle," is very annoying in houses at 

 night. Its egg capsules are parasitized by Evania afpendig aster ^ 

 which is in turn parasitized by Tctrasticlius hagenowi. Book lice, 

 Troctes divinatoina^ and silver fish, probably Lepisma saccharina. as 

 well as cockroaches, get into library shelves and do considerable dam- 

 age to books. The Formicidse are represented by about 15 or 16 

 species. Several of these are common about houses, especially the 

 fire ant, which is granivorous. The camponotine ants of the forests 

 are parasitized by a Pseudochalcura, and there is also a common 

 myrmelleonid, the larva of which preys upon ants. It is common 

 both in the woods and around habitations. A termite does consider- 

 able damage to woodwork, books, records, etc. The bedbug, Cimex 

 lecfrdarius, is common in houses, and the bodies of the natives are 

 often infested with lice, both Phthirius inguinalis and P. capitata. 



BENEFICIAL INSECTS. 



The island is fairly well provided with predaceous and parasitic 

 forms, which check the excessive multiplication of injurious species. 

 There are three connnon coccinellids {TTanvonia (tiruata, C off > nella 

 repanda^ and Davlis midsnidi) preying on plant lice and leafhoppers, 

 and another, a Scymnus, inimical to mealy bugs. The larva of a 



