Daniel V. Hagan

Culicoides responses to 1-octen-3-ol and carbon dioxide in salt marshes near Sea Island, Georgia, U.S.A.

Abstract. The semiochemicals carbon dioxide (CO2) and l‐octen‐3‐ol (octenol) were evaluated as attractants at several release rates, alone and in combination, for the major coastal species of biting midges in Georgia: Culicoides furens, C.hollensis and C.melleus (Diptera: Ceratopogonidae). The data show that CO2 is an effective attractant for the females of all three species, but each has a different response pattern. In contrast, octenol was an effective attractant only for C.furens, either alone or in combination with CO2; octenol had a repellent effect on the other two species. The combination of octenol and C02 had a synergistic effect on the collections of C.furens.

Mouthparts, antennae and genitalia of intersex Culicoides stellifer parasitized by mermithid nematodes.

Abstract A 12‐month study of Culicoides in Bulloch County, Georgia, U.S.A., revealed that twelve of23,859 specimens (0.05%) of C.stellifer were intersexes as a result of being parasitized by mermithid nematodes. Of these, eleven had male genitalia and female type antennae and one had female genitalia with male type antennae.

Comparative study of mouthparts of four species of Culicoides from Tibet.

Abstract. Mouthparts of four species of Culicoides from Tibet were studied by light and scanning electron microscopy (SEM). Photomicrographs were made of the mandible, labrum, hypopharynx, lacinia, and the sensory pit of the third palpal segment for each of the four species. Values for eighteen characters of five structures are presented graphically.

Caeculus crossleyi n. sp. (Acari: Caeculidae) from granite outcrops in Georgia, U.S.A.

Abstract Caeculus crossleyi is described as new from beneath rocks on granite outcrops in DeKalb and Rockdale Counties, Georgia, U.S.A.