TY  - JOUR 
T1  - Seasonal distribution of a relatively rare and a relatively common species of Thecomyia at Belém, Pará, Brazil (Diptera: Sciomyzidae)
JO  - Memórias do Instituto Oswaldo Cruz
A1  - Knutson, Lloyd
A1  - Carvalho, Claudio José Barros de
SN  - 0074-0276
UL  - 10.1590/S0074-02761989000800050
VL  - 84 
Y1  - 1989
PB  - Brasil 
ER  -