Mission Insurance expects to report a loss for ’84.

In disclosing the expected loss for the year ended last Dec. 31 and for the fourth quarter, the Los Angeles-based insurance holding company blamed “the continued deterioration of underwriting results.” Mission Insurance Group, which had a net loss of $99.7 million on revenue of $399 million for the first nine months of the year, said it expects the losses to be “substantial” but is awaiting the results of its 1984 audit before quantifying the extent of its financial slide.